Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b935e853485fd20…

MALICIOUS

PDF

47.4 KB Created: 2020-08-08 21:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef40d5a6e1e2a7f81dfafab5afcaeb63 SHA-1: d8ae4925b68fdcdd58f66a17388a58f365cf3d8e SHA-256: 1b935e853485fd200a569da06fd4cb1d3d6930b457c9b9be6307885d9c8e17d6
152 Risk Score

Malware Insights

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

The PDF document contains a link farm and a direct link to a known malicious redirector, disguised as a guide for printing HTML to PDF. The ML classifier strongly indicated maliciousness. The document body itself is heavily obfuscated but contains the malicious URL and several benign-looking URLs hosted on Shopify, likely for SEO poisoning or to appear legitimate. No scripts were extracted, but the primary attack vector is the malicious redirector.

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=comment+imprimer+une+page+html+en+pdf
    • http://files.lisasturm.com/uploads/1/3/0/8/130874612/negiligag-welibugusug-fezudagelavibel.pdf
    • http://files.northdeltasunfish.ca/uploads/1/3/0/7/130775441/maxidukodogi-nofuligiwe-sezutofepi.pdf
    • http://files.musicandartattrinity.org/uploads/1/3/0/8/130813511/waxikij_zimolot_teduvidu.pdf
    • http://files.turlocktransit.com/uploads/1/3/1/4/131406732/6218c.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/26493984112.pdf
    • https://cdn.shopify.com/s/files/1/0438/2860/9186/files/anaconda_python_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/5136/0164/files/maxudoxox.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/xezigurixurab.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/juditomuxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0330/files/legubodumekug.pdf
    • https://cdn.shopify.com/s/files/1/0436/4887/6697/files/prefix_and_suffix_worksheet_for_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7137/files/zewefapoferamixuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/1909/8522/files/62000817497.pdf
    • https://cdn.shopify.com/s/files/1/0431/7439/6058/files/3721948.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/raguzobegugovi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7270/7990/files/xejogisorinejimetogo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xidegafizupewutuzu.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_off0000699c.bin
cc9fa03293c5d42d302b43cd2ac83ad8e84a730d9a37418b169c105b9042b310		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699C 5184 bytes
font_01_sfnt_off00007b0b.bin
91cd315307c936a96063c2e09705a7f8b9572fbd5a163a99715b71835d9eb1cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0B 11520 bytes
font_02_sfnt_off0000a025.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA025 4324 bytes

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