Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c1be68f483417e…

MALICIOUS

PDF

43.3 KB Created: 2020-08-12 03:40:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 100bf5bd81157e4136cd62ba90da84a1 SHA-1: caf0ad01a18efd00d208c68e8d8da8a63a99714f SHA-256: d7c1be68f483417e4aa94f09a7267004d847d91b736cfabdfdd3eae0e56fd373
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=converter+pdf+em+word+gratuito+i+love'. This link is presented within the document body, disguised as a free PDF to Word converter. The document also features a large number of external PDF links, many hosted on Shopify domains, suggesting a link farm for SEO manipulation or to obscure the primary malicious destination. The ML classifier strongly flagged this PDF as malicious.

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.cc/pify?keyword=converter+pdf+em+word+gratuito+i+love
    • http://files.wgscontemporary.com/uploads/1/3/1/0/131069899/4885920.pdf
    • http://xaduxanob.southerncharmcbd.com/uploads/1/3/2/7/132710712/b60baa005.pdf
    • http://files.joanphillipspsych.com/uploads/1/3/2/7/132710694/e87225.pdf
    • http://wajudopu.yinwithlisa.com/uploads/1/3/2/7/132740435/goxunexitowisusovutu.pdf
    • http://files.altezagen.com/uploads/1/3/2/6/132681992/eb96dde2122.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1315/files/55888015236.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/63197708787.pdf
    • https://cdn.shopify.com/s/files/1/0437/5448/7957/files/pabivumajudusopasisenos.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/61548833618.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/lemalan.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/72398978279.pdf
    • https://cdn.shopify.com/s/files/1/0439/3772/6622/files/barthes_semiotics.pdf
    • https://cdn.shopify.com/s/files/1/0431/0607/4780/files/zejatosixesoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/7552/6042/files/punutegugu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/tesazoture.pdf
    • https://cdn.shopify.com/s/files/1/0436/0011/7928/files/batch_convert_files_to.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_off00005e15.bin
f57877004f85131af3310644da6189354509fb570226d12fd747fe8b1280a3ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E15 5240 bytes
font_01_sfnt_off00006fe7.bin
5cb396fb2972274fa99827ae5b8ac4189764cf9848226603c96a98b0287631f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE7 9936 bytes
font_02_sfnt_off000091e5.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91E5 4324 bytes

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