Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ce6b9633374550…

MALICIOUS

PDF

44.4 KB Created: 2020-08-09 15:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcef38cb2b18e8a77cb9b158ff0fa23c SHA-1: 42ffc3705fed253efc097651ab67b52598c2cfc8 SHA-256: 93ce6b9633374550bc98b99f329b77f71032763f3d93f4fabe9b8fb54a255b87
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating it's a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=amritsar+map+pdf. The document body, though heavily obfuscated, contains references to this URL and other PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=amritsar+map+pdf
    • http://files.acaciaaccessories.com/uploads/1/3/0/8/130813887/gidolasoz-gakugafi.pdf
    • http://files.anchorelpaso.com/uploads/1/3/1/4/131437139/c979ce.pdf
    • http://files.allenpc.org/uploads/1/3/1/4/131437532/temukalugag-numogagix-faxuwipatojilu.pdf
    • http://zebanazet.mslaneapgov-econ.com/uploads/1/3/1/3/131398140/bunijeliwirog_xeful_jexazoduk_jufudijojezaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2645/files/wetesinosuvasew.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/chrysler_pacifica_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/8855/9780/files/gekade.pdf
    • https://cdn.shopify.com/s/files/1/0430/8185/9225/files/danupuwenajudixofa.pdf
    • https://cdn.shopify.com/s/files/1/0447/9077/5965/files/jukedilojebusadatikesiluk.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/vefozetefosose.pdf
    • https://cdn.shopify.com/s/files/1/0440/2675/7270/files/zobobijojixi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/american_government_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tefukina.pdf
    • https://cdn.shopify.com/s/files/1/0437/6284/3797/files/41581940425.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1879/files/21359934806.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_off00006246.bin
49a45bd0557d3c0f048a72001736985cce93f6d4292a78cb17c7360be2466b4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6246 4600 bytes
font_01_sfnt_off000071d1.bin
895b3426f467c00b994bc0c27f8e7f8dc8c6f5842dd6b3bcd35eeab0af253bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D1 11072 bytes
font_02_sfnt_off000096c4.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96C4 4324 bytes

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