Malicious PDF — malware analysis report

Static analysis result for SHA-256 62df4ea779bbb94f…

MALICIOUS

PDF

73.8 KB Created: 2020-08-13 23:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e585b5b5bc511433e7000e91cf6ef73 SHA-1: 595cf0160c75270e5b8cb716fa37b964b5fa1372 SHA-256: 62df4ea779bbb94fecc927f355089a0cc3e1fbb1782a234efc20cc476c6ad6d9
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 potentially malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting an attempt to manipulate search engine results or direct users to unwanted content. The ML classifier also strongly flagged this PDF as malicious.

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=psoriasiform+dermatitis+wikipedia
    • http://siwejeb.mytwinoakshoa.com/uploads/1/3/2/3/132302780/176c4fb2e510.pdf
    • http://files.all4pawsdogrescue.com.au/uploads/1/3/1/4/131455883/9425829.pdf
    • http://files.variablerateintercooling.com/uploads/1/3/1/3/131380870/7671165.pdf
    • http://files.livehealthywithcancer.com/uploads/1/3/1/8/131857723/8621480.pdf
    • http://pigusa.wallinba.com/uploads/1/3/0/8/130814328/3836390.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3706/3328/files/sylvester_stallone_porno.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/17177055942.pdf
    • https://cdn.shopify.com/s/files/1/0448/5827/8050/files/ahsanul_bayan_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/3859/6510/files/20817901431.pdf
    • https://cdn.shopify.com/s/files/1/0430/2058/3065/files/27243398613.pdf
    • https://cdn.shopify.com/s/files/1/0432/1135/8369/files/editing_file_in_word.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/74543717356.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3493/files/vapiwuxijopeligimepid.pdf
    • https://cdn.shopify.com/s/files/1/0431/5768/4375/files/wanuweteresuje.pdf
    • https://cdn.shopify.com/s/files/1/0433/6504/0282/files/19372302649.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/83676762753.pdf
    • https://cdn.shopify.com/s/files/1/0444/3452/2279/files/kafulavumubugazibetodox.pdf
    • https://cdn.shopify.com/s/files/1/0429/6871/1321/files/wubusitagozurabi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4987/6630/files/92980266859.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_off0000de16.bin
f7d74ef1758bf1e80af6a9f4e5bee02eb75b0e01e1cf058cf3e441b486335fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE16 5312 bytes
font_01_sfnt_off0000f025.bin
79dd2665f35d99f06a23d9967f194e2499a4224e89762762a78b951a578eb89d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 12644 bytes

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