Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19834732c9ce5e6…

MALICIOUS

PDF

38.7 KB Created: 2020-08-09 22:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d221a78edf150fecfaf4724a15b87388 SHA-1: d2e8c7d7ba7199077e261dcf36f88023b6decb1d SHA-256: d19834732c9ce5e6d5e4f7f3a1f5e0baaad57a8737d463f7d6f38f255f0528ab
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=paris+talks+abdu+l+baha+pdf`. The ML classifier strongly supports the malicious nature of this PDF. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL within it further supports the malicious intent.

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=paris+talks+abdu+l+baha+pdf
    • http://files.sanantoniosalsaon2.com/uploads/1/3/1/6/131606094/1774963.pdf
    • http://files.352coaching.com/uploads/1/3/1/4/131453636/tixukef.pdf
    • http://files.michelleclarkvm.co.uk/uploads/1/3/0/9/130969313/80d6db4dae0.pdf
    • http://lugamu.williecosta.com/uploads/1/3/0/8/130874655/4045253.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lonuxifipepi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/nedafolasebowamanisijo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/10462851746.pdf
    • https://cdn.shopify.com/s/files/1/0428/7728/8611/files/occupational_safety_and_health_journal.pdf
    • https://cdn.shopify.com/s/files/1/0451/1324/5848/files/disable_dns_lookup.pdf
    • https://cdn.shopify.com/s/files/1/0437/8879/6065/files/nordstrom_employee_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0446/9296/3484/files/77461853324.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0437/files/41269878782.pdf
    • https://cdn.shopify.com/s/files/1/0437/3846/4405/files/reduced_adverb_time_clauses_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/4634/5640/files/pezipekuzis.pdf
    • https://cdn.shopify.com/s/files/1/0440/1430/5430/files/zimumokajuvurinisusi.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_off00004c8f.bin
bee3425569f8899c001161d1b4da7f2e8fa8b297a79ba55cec62dad50a05bafd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C8F 4884 bytes
font_01_sfnt_off00005d1f.bin
b8710be7858c3f1ad9129a61dff67b0681924a50b7e625b2b09a70ccf75a1c8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1F 10364 bytes
font_02_sfnt_off00007ff3.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF3 4324 bytes

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