Malicious PDF — malware analysis report

Static analysis result for SHA-256 a895498517dfa6c2…

MALICIOUS

PDF

52.9 KB Created: 2020-08-14 02:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f7fdb01cb6a44787e0cc5b3c4858078 SHA-1: b204616c31c766bfba18053df1c6081e369343e9 SHA-256: a895498517dfa6c21b2ad69898b016b2c685ad4f766dd02caddf85a273e1db62
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure users to malicious content. The primary attack pattern involves redirecting users through a chain of links, likely to a phishing or malware distribution site.

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=gbf+anubis+guide
    • http://files.thesagaponackfarm.org/uploads/1/3/1/3/131380146/dibakigisaned.pdf
    • http://files.orpheusnorthherts.com/uploads/1/3/0/7/130775732/jonevegaze-foxog-sigutozilazo-pabigas.pdf
    • http://files.ramsgateswissys.com/uploads/1/3/1/3/131383630/b8035b6b893aa44.pdf
    • http://files.burbgarden.com/uploads/1/3/1/8/131857112/nibug-wapigusinikepek-rumavijuv-livizubageseni.pdf
    • http://files.mizpah36.org/uploads/1/3/1/3/131379045/6624586.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/real_estate_wholesale_purchase_agreement_contract.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/writing_sample_for_phd_application.pdf
    • https://cdn.shopify.com/s/files/1/0438/2733/1232/files/10076932312.pdf
    • https://cdn.shopify.com/s/files/1/0430/5793/8581/files/antifriction_bearings.pdf
    • https://cdn.shopify.com/s/files/1/0438/0380/3808/files/water_soluble_and_fat_soluble_vitamins.pdf
    • https://cdn.shopify.com/s/files/1/0427/8163/8812/files/42649283667.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4564/files/5923234791.pdf
    • https://cdn.shopify.com/s/files/1/0435/9880/7202/files/60938845428.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewugokujugiwiburonanas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ranugebiwuzejivuzuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/3768/7962/files/16058996282.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wadilizesiwegokadokepub.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_off000084ae.bin
4ebaf7dafc346b8be3d2b70a2025e8c1760c6ad4d19996b98ef4064027942641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84AE 4808 bytes
font_01_sfnt_off00009518.bin
db4e0c3bbdef724731c9d2a11fca59d0776d4a2c4e97604bb6cdda8a8a46ddc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9518 10400 bytes
font_02_sfnt_off0000b89c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB89C 4324 bytes

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