Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33f50974898782f…

MALICIOUS

PDF

41.2 KB Created: 2020-10-30 00:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: aa7e24f9cfdbeb76d9c54bf76bd987fd SHA-1: 9c312d92ae512bd1b72643cc0cb125357ab738a7 SHA-256: a33f50974898782f15dee243b9a89cb5349e35fcd2d935b9b8178812409e0052
242 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?keyword=skidrow+password+survey In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374362/normal_5f8a74d48eb34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f878c43d7616.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/1158663.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/besonimoke-tomigajowoj-nagano.pdfIn PDF document text
    • https://zakiguranul.weebly.com/uploads/1/3/4/4/134480990/likulu.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/1/0505/1590/2636/files/posey_bed_alarm_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2651/2544/files/raxit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5104/1447/files/pdf_to_word_conversion_i_love.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7811/4199/files/71652393167.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9574/7488/files/clinical_guidelines_for_treatment_of_delirium.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0030/5082/files/auto_rotate_screen_android.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C60 5340 bytes
SHA-256: a9ca632657579a401cd2e79775b44cc82876c92ccd4d5180171d6513f0e8d819
font_01_sfnt_off00005eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB3 10380 bytes
SHA-256: 7eac5eb2686c2d4f8c77fb99b21cddb23569e586aa3c42cf8eb1c138fee0bdf5
font_02_sfnt_off0000826b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x826B 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b

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