Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad1736ff63f531c…

MALICIOUS

PDF

81.3 KB Created: 2020-10-31 19:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d0f185fd919b1f341991a6c85a8e95e8 SHA-1: 43183666a4988bc914ff2076e8d24068f847016b SHA-256: bad1736ff63f531ce0c134e9aed8f0f1db034c38bf562b76fc46f440b7ef580b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF SEO link farm, with numerous external links, one of which is to a known malicious domain. The document body contains text related to game scripts and a URL that aligns with the malicious redirector heuristic.

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://ggtraff.ru/aws?keyword=phantom+forces+script+2020+pastebin+aimbot In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5f961ba394b43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/subud/77692274699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91eb0608-a1f1-4ae2-94e0-a3c77867e5b2/1072242092.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/9031/4141/files/heavy_free_radicals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5435/1015/files/fair_trade_brand_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/22280627108.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9115/5361/files/free_xbox_live_codes_2015_no_surveys_or_offers.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/mcq_abdomen_anatomy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2186/8449/files/mysticism_christian_and_buddhist.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2212/1122/files/zekujomuzikudeve.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/treatment_of_lung_cancer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592a1dd3-ff93-470a-9ba2-d71fd811a435/forojif.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/85905961404.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8888/0821/files/kissing_bug_florida_2020.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001034f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1034F 30232 bytes
SHA-256: ff89011e67a55114a5a7bfe5fda8371484b9faf32d0608a08d1990150d200c69
font_00_sfnt_off0000c9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 5636 bytes
SHA-256: dcac4b0f2204d20ee94fcbbe7f5a21d20d0f304cee76dd704646e69d17688d6e
font_01_sfnt_off0000dcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 11224 bytes
SHA-256: 207e0690b9f9be6a34c848750044713143858fc51a055cb17c2eb435a2bc845d

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