Malicious PDF — malware analysis report

Static analysis result for SHA-256 81323957837a5083…

MALICIOUS

PDF

58.2 KB Created: 2020-10-15 01:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 23f0fb6bb4503510c1c0f2cce1c42747 SHA-1: 5ab464db0bb0cd6fabdb2ba0ed4ad6c823943431 SHA-256: 81323957837a50831dc50a2c111bfd54cc5e7a44391610fb57f910a40235ed34
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/pify?keyword=belajar+tajwid+lengkap+pdf In PDF document text
    • https://site-1039676.mozfiles.com/files/1039676/75377743028.pdfIn PDF document text
    • https://site-1039173.mozfiles.com/files/1039173/gezudazusumawofaw.pdfIn PDF document text
    • https://site-1048292.mozfiles.com/files/1048292/97581240803.pdfIn PDF document text
    • https://site-1038743.mozfiles.com/files/1038743/68363879770.pdfIn PDF document text
    • https://site-1038835.mozfiles.com/files/1038835/fiwipizovafiwiful.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/b1967483.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/9251850.pdfIn PDF document text
    • https://site-1042834.mozfiles.com/files/1042834/35837382647.pdfIn PDF document text
    • https://site-1041491.mozfiles.com/files/1041491/pudupajobijujupijumenaxe.pdfIn PDF document text
    • https://site-1041091.mozfiles.com/files/1041091/combine_pages_into_a.pdfIn PDF document text
    • https://site-1039896.mozfiles.com/files/1039896/midozevidirizomekarifa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3499/1528/files/timufu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3971/1644/files/34450077347.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7744/4777/files/aa_12_shotgun_video_youtube.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1757/6354/files/28159739887.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5901/9421/files/koxokokas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8285/8144/files/61599703450.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/22050973676.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8059/6638/files/zujafebefivarul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/0522/3327/files/ap_world_history_period_6_key_concepts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3197/7369/files/70816330898.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2630/3136/files/calories_in_tuna_steak_salad.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000b380.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB380 22140 bytes
SHA-256: f25906f29305ef94916e3112b77c97302c683f94a805ba9621bac4c7c821e21a
font_00_sfnt_off000073b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B5 5312 bytes
SHA-256: 5c61b8c05f8000808defd60187e62b15f13577143fc455f1db0d7aa78870d511
font_01_sfnt_off000085b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B2 2644 bytes
SHA-256: 1e53ac68b53c38ceacecf3f1639f28b0cc23e038c9ddce9ad139fcad9643d2f1
font_02_sfnt_off00008ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF8 10316 bytes
SHA-256: 027adb28653afbf5a82c92bf0391ea238aafbb5cde3705e0f493acba4a9f91c2