Malicious PDF — malware analysis report

Static analysis result for SHA-256 828e91e0b1145331…

MALICIOUS

PDF

46.5 KB Created: 2020-10-12 06:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d160fe6d542b691205a0ccf234041663 SHA-1: 203ac7a488e9594ffd9f5b40d984407ba984595b SHA-256: 828e91e0b1145331b4eb6289a1b0311e0500f6788eda6227188d804fb4b46639
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that is also present in the heuristic findings, suggesting it's the primary lure. The ML classifier strongly indicates maliciousness, and the overall structure points to a link farm used to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.com/pify?keyword=natural+selection+and+adaptation+worksheet+answers In PDF document text
    • https://site-1043132.mozfiles.com/files/1043132/50174925660.pdfIn PDF document text
    • https://site-1039795.mozfiles.com/files/1039795/41544377740.pdfIn PDF document text
    • https://site-1036785.mozfiles.com/files/1036785/danubidavegitilopakore.pdfIn PDF document text
    • https://site-1040322.mozfiles.com/files/1040322/73976725251.pdfIn PDF document text
    • https://site-1039698.mozfiles.com/files/1039698/buxotetaperotamepujogoxi.pdfIn PDF document text
    • http://lomiki.redrivergorgeguide.com/uploads/1/3/2/7/132740900/nadigajamun.pdfIn PDF document text
    • http://befuw.malebeautybible.com/uploads/1/3/1/4/131408899/798765.pdfIn PDF document text
    • http://files.acubyhoma.com/uploads/1/3/2/6/132696285/tarupazezaluferefa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7927/7467/files/minnie_mouse_cakes_1st_birthday.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1794/0375/files/60175344262.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1565/8401/files/69607714663.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9878/6971/files/american_rabbit_breeders_association_book_of_standards.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8806/8254/files/wotivumeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e06b751-4198-4994-893a-a71a32eeb171/tomegeliriwukibog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27442f3-e401-4d45-bcc0-940dab9337ad/xumazuzezobegupun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3e896e4-45a6-4381-9e96-08371af69434/8212259008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c23768-42b5-4e0c-b0a2-4527f7e0dc98/pixitoxur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48961b1-4f3d-4baa-acae-24c7aa498cbe/tamibugazojirudox.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_off00006a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A88 5168 bytes
SHA-256: 976a1b2ae9be386357035225fa68bcb2a0775dca77beab9c8560c9d6a800fac7
font_01_sfnt_off00007c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C22 10032 bytes
SHA-256: 16190d9443271304bd67e2c2b26f246b8321eda373cb63eb25eeb911ff195a28
font_02_sfnt_off00009e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E76 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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