Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a95a03b9989587…

MALICIOUS

PDF

40.6 KB Created: 2020-09-12 14:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 1a0d9084f4612fca99fd8a4fee273bda SHA-1: b8c228083059c00af6b86effc0e081741f8088ec SHA-256: 28a95a03b9989587a76813f25770cb6900bdc836e23ba98c4ce19116cab4f472
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://ttraff.club/pify?keyword=assignment+abroad+times+epaper+pdf In PDF document text
    • http://files.goldensnowfox.com/uploads/1/3/1/4/131483662/96c551.pdfIn PDF document text
    • http://juwema.hopeamc.com/uploads/1/3/0/8/130873715/nebubevolidux-rijupasodajir-nuraxe-xipuvuvivaz.pdfIn PDF document text
    • http://files.marisakeller.com/uploads/1/3/0/7/130775134/xofutosodogagof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/a2de88_bc4a021c9a5a41d78c7b1850ed0f33d0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/51c472_772df3b845564790a753896b833a7176.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2541/6860/files/57525872083.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6924/3553/files/67905899659.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/72450789096.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9276/3039/files/bamford_stroke_classification.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6499/9590/files/convertible_debt_term_sheet_example.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5513 5456 bytes
SHA-256: 7f176ac976924fb8379feb49c03b8c576c24f00513f15dd1f160b56f33380429
font_01_sfnt_off00006777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6777 3276 bytes
SHA-256: d0357d50b68613263c41b404a3fe3e9a53dbbad7acf660d8260f86431fd91cf0
font_02_sfnt_off00007347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7347 9972 bytes
SHA-256: 19478a94fb773abf742c7edcd6b898d577e2aacc86798f6c42c74d7dbf3f3799