Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f1c188b2e28a0a…

MALICIOUS

PDF

44.7 KB Created: 2020-08-08 07:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d190340dc9b48695e14d0b0aa3926c6 SHA-1: 1ace10a7d1d786ae4bb8607aa3efe201e2941229 SHA-256: 96f1c188b2e28a0a6c730e6a8f6a4c001321e708c0b862dc818314fffc8032ae
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to 'abnormal behavior theory'. The primary attack vector is likely social engineering via a malicious link within the 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.ru/pify?keyword=abnormal+behavior+theory+pdf
    • http://rolid.cashatmservices.com/uploads/1/3/1/4/131453133/kuxutel-mobununuruva-tuwudilafugupo.pdf
    • http://nabeg.a1-therapy.com/uploads/1/3/1/3/131379803/nanipuxe.pdf
    • http://files.emilymullikindesign.com/uploads/1/3/1/6/131636766/narisixixe.pdf
    • http://files.mrgatewoodcody.com/uploads/1/3/1/0/131070289/gililegaxepajilu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5245/7369/files/sharp_aquos_tv_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0134/files/active_directory_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5385/files/72382431550.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8095/files/venture_capital_and_private_equity_a_casebook_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0020/9319/files/83405851699.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/bilaresatizuvafugaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/7500/9696/files/membrane_proteins.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rimudunibodosugesujusuvud.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/19534474999.pdf
    • https://cdn.shopify.com/s/files/1/0431/8615/9767/files/74711609752.pdf
    • https://cdn.shopify.com/s/files/1/0433/8538/9221/files/pujus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064fa.bin
f91a53aa6ed9b702bf66df8809fb6e120153be49f5d14f7e94b0bb1560b64a52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FA 5180 bytes
font_01_sfnt_off00007660.bin
4f34e3660a87334e03b911639621eed367e1c3d6f2305289983adbf0fbccc9a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7660 9796 bytes
font_02_sfnt_off000097fa.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97FA 4324 bytes

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