Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d6184cd0c3953d…

MALICIOUS

PDF

49.3 KB Created: 2020-07-19 12:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd785e51aeb98d1cb552eda295073379 SHA-1: afef8f77b41e7f6088ab9cf1fae53d407b5490ca SHA-256: a8d6184cd0c3953d21033756a69ccc5314726d59e31fd8b3cf2b38c81759fdad
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, suggests a theme related to PDF conversion, likely a lure. The presence of a link farm and a redirector points towards a phishing or malware distribution attempt.

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=web+pages+to+pdf+converter
    • http://files.tgsglass.com/uploads/1/3/1/3/131383581/bafebamupafisa-keriverijanibab-gojivetoxur-forexavoguwofe.pdf
    • http://files.dhanaksamaj.com/uploads/1/3/1/3/131384171/1082962.pdf
    • http://files.eliseblackwrites.com/uploads/1/3/1/3/131381612/31c5308.pdf
    • http://files.evolvenowinc.com/uploads/1/3/1/6/131636792/gojol-foxubekuvanogi-xojikamotefefuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/9736/6436/files/lagog.pdf
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/47669629254.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bafewemuwidizisaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mubexuv.pdf
    • https://dovepuvo.files.wordpress.com/2020/06/10311789214.pdf
    • https://wemowuj.files.wordpress.com/2020/06/47825225105.pdf
    • https://telomema.files.wordpress.com/2020/07/72309946966.pdf
    • https://woxujobeza.files.wordpress.com/2020/06/47571749358.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81256704061.pdf
    • https://cdn.shopify.com/s/files/1/0428/5209/0022/files/zalujup.pdf
    • https://cdn.shopify.com/s/files/1/0429/7090/6780/files/85532728394.pdf
    • https://cdn.shopify.com/s/files/1/0433/7899/9446/files/pajegilitajutobuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/4484/7261/files/punisofamadadupesuderagal.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/nizilakekituxararopowu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4948/3426/files/muzikotulinoxilafumap.pdf
    • https://cdn.shopify.com/s/files/1/0433/6071/4904/files/85355643518.pdf
    • https://cdn.shopify.com/s/files/1/0437/4993/3208/files/72634048445.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082f8.bin
bc91ebd80ffb1f5e44d8b1c7d7b8b0b9a4fb141ed11f211c713ceb339782b8d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F8 5244 bytes
font_01_sfnt_off000094da.bin
6a7ca5eae99e8e5a4cd3568247689872f2b5339d707e1f1e83c9c6cc8d85c311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94DA 10156 bytes

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