Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d9d7bc76f4c119d…

MALICIOUS

PDF

45.4 KB Created: 2020-08-08 12:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3761e8d16445689ee53461c4b8499e2 SHA-1: 7148ab16a3712efb15c2a2d143e2277b067343ed SHA-256: 0d9d7bc76f4c119d21554303695087b7cf2dd52c539eb75e0009490365abb7f9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with 16 external PDF links, many hosted on Shopify, and a primary redirector URL. This indicates a likely SEO poisoning or link-farming attack pattern designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=introducing+autodesk+maya+2020+pdf
    • http://files.lykeys.com.au/uploads/1/3/0/8/130873869/29c4020b7.pdf
    • http://files.fritzpolzer.com/uploads/1/3/2/3/132303229/sokubanusa.pdf
    • http://files.balance-bicycle.com/uploads/1/3/1/4/131406222/8170486.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/85871157128.pdf
    • https://cdn.shopify.com/s/files/1/0428/1945/3095/files/17734514921.pdf
    • https://cdn.shopify.com/s/files/1/0434/8579/0365/files/negative_effects_of_globalization.pdf
    • https://cdn.shopify.com/s/files/1/0433/5134/3269/files/balanopostitis_en_nios_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0437/8591/2472/files/zerizedozobosavibulon.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/tetegodewiwokibuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/6646/6216/files/womazozodisagano.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/gotezekedipedovalad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57515970725.pdf
    • https://cdn.shopify.com/s/files/1/0437/6769/3474/files/save_webpage_as_firefox_extension.pdf
    • https://cdn.shopify.com/s/files/1/0438/3975/0294/files/fixupadadejoji.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/14542016730.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/40987441718.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006533.bin
86bb374d2999c60c6508a88b732853d563de79ed125dc59a446e90744d51fd27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6533 5704 bytes
font_01_sfnt_off00007891.bin
22c134d8d255c4a4b7c749bd575e844ca92dc8b329383102ea83811f6a3a0f97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7891 9864 bytes
font_02_sfnt_off00009a12.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A12 4324 bytes

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