Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1d63416dabdc48…

MALICIOUS

PDF

42.2 KB Created: 2020-10-05 14:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7fd304b9e773b19f7af553dcf5b422bf SHA-1: 33664138793e3f71ea533cfc00a62112daddbfde SHA-256: 5a1d63416dabdc48af8393af9d9a9eb141a40a81c644b8f27e6d492540038479
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://cctraff.ru/strik?keyword=download+ram+expander+cracked+apk In PDF document text
    • http://nimolo.barefoottofino.com/uploads/1/3/2/7/132741009/8569925.pdfIn PDF document text
    • http://desupigu.retroca.com/uploads/1/3/0/7/130739892/7854976.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/1/0482/9963/8945/files/zikozesowokekexoke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6763/7914/files/rejenede.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7168/4256/files/jukebox_title_strips.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0673/2699/files/83981531026.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9892/5976/files/great_white_shark_strain_grow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1dffbfe-ecfc-4f8d-9c9f-0cd6a7526144/13432886725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d92c9cc-6bd7-4e16-8ee4-1f37e694828d/6356107577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a4116b-ad76-46ed-a7a5-2dfb5efe6391/31700281705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fecef47-b25c-4c73-b548-291750999f18/8725004796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e82e408f-c4dd-43ec-9b7b-e463ca37fa21/bobosigamudimowas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6116/5723/files/baby_did_a_bad_bad_thing_zz_top.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7484/2531/files/katiwepira.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000639a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639A 5264 bytes
SHA-256: 4b114a2352852817da73957e93ee3ecff3c281bca5e033572e4436b15ad9e106
font_01_sfnt_off00007589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7589 11884 bytes
SHA-256: cfd8746a2775a7a1d9e581466e9cae0269417f5d39afeb501446126eefda1a85

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