Malicious PDF — malware analysis report

Static analysis result for SHA-256 689e1f2b8ee8b2f3…

MALICIOUS

PDF

49.8 KB Created: 2020-07-29 03:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4a92fa064fa549f26e9d06274354989 SHA-1: 521b3c06bc57d59b6604113214c36737799e1700 SHA-256: 689e1f2b8ee8b2f3b40548d50461cc2e77c82d26ad877ec232908966e48ec9c9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of a malicious redirector and a link farm suggests an attempt to direct users to harmful content, potentially for phishing or malware distribution.

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=reformed+baptist+seminary+sacramento
    • http://files.cmsmustangband.com/uploads/1/3/1/4/131438741/nipefalo.pdf
    • http://files.idealformsnyc.com/uploads/1/3/2/7/132740296/tiveliwaxi_mofipiwigo_tulikatiziv.pdf
    • http://files.bainbridge-ny-rotary.com/uploads/1/3/0/8/130873829/9573480.pdf
    • http://files.juvenileoffice.org/uploads/1/3/2/7/132740405/votiluxego.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/rinexev.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/20068876242.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2902/files/66550728786.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16711599054.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/nobomitupojofa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/96551960213.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/nunaserevede.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/xajuxikisi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/lerixisagiduf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rosetotirumeza.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/22257203976.pdf
    • https://cdn.shopify.com/s/files/1/0433/7949/0968/files/feroruruxasifirejok.pdf
    • https://cdn.shopify.com/s/files/1/0436/4628/8025/files/50752421951.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0021/files/73865778715.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000842c.bin
99fe1847c19f002815c4d8fe60e39c249fe0dbf1b1ae98d78e05f6ad56c9b1d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x842C 5308 bytes
font_01_sfnt_off0000961f.bin
bb065f1a949887270b25ebcf68bc865bda5dbd2205fbfb2e8fd435ff78a6c0b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x961F 10368 bytes

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