Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fa4e10e6f6c158…

MALICIOUS

PDF

46.1 KB Created: 2020-08-30 20:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6fa822213fadbb5dc2d35acb41326d7 SHA-1: 3f373f95f9a630790d18dc6f994a2b712b67d573 SHA-256: 05fa4e10e6f6c1580859d976ee0a1ee262445957189412cf28b11371c4de9cb1
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, one of which points to a potentially malicious URL. While no scripts were extracted, the embedded URLs and the PDF structure suggest an attempt to lure users to malicious content or manipulate search engine rankings.

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.ru/wix?keyword=33+hour+chick+embryo
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1117/6610/files/borders_thomas_king_lesson_plan.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/jegipozanawabigudalokoba.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5377/files/english_speaking_book_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nozawilod.pdf
    • https://static.usrfiles.com/ugd/b8c837_81f7a9d0b08a4f23aefb4664121db55e.pdf
    • https://static.usrfiles.com/ugd/136d07_6145c782c46d4e6e85d37ad92be024e3.pdf
    • https://static.usrfiles.com/ugd/6116da_2fb5b7ac152241ccac46b97db892bf57.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/32488155819.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/dr_sc_sharma_accountancy_class_12_solutions_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/xanadowebow.pdf
    • https://cdn.shopify.com/s/files/1/0436/6719/4021/files/3981066680.pdf
    • https://cdn.shopify.com/s/files/1/0437/5802/6903/files/vuwadutuborokepew.pdf
    • https://cdn.shopify.com/s/files/1/0433/9531/7911/files/winofaxim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000776d.bin
012c0180d9684bf7326c541a98dc2f9a79b889d4c265dbaf88dddbb8e12f771e
pdf-font-stream PDF embedded font (sfnt) at offset 0x776D 4992 bytes
font_01_sfnt_off00008850.bin
b746d8bc3b33b93a76350246765e96b7f74aebeec53f95c55a1304455116a5c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8850 10344 bytes