Malicious PDF — malware analysis report

Static analysis result for SHA-256 516473538c96990f…

MALICIOUS

PDF

43.6 KB Created: 2020-07-22 11:39:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14135b0ae39b9cdd0af12330877f2528 SHA-1: 58f33f7fbd12e9d605034133cf3f9be8200331bc SHA-256: 516473538c96990f68a041416d8e40da4ca69002c091eaf65fb9becb95e4b2fe
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure (ttraff.com). The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be related to a worksheet, suggesting a lure. The presence of many links, including to Shopify, indicates an attempt to distribute content or redirect users to malicious sites.

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.com/wb?keyword=limited%20vs%20unlimited%20government%20worksheet
    • http://files.blockchaininvestments.nl/uploads/1/3/1/1/131163910/voninovogu.pdf
    • http://files.dearfriendfrank.com/uploads/1/3/0/8/130874031/tirijiduj-bogebebanimavix-nijokomigutozi-kadekolelipeso.pdf
    • http://files.theomrpa.com/uploads/1/3/0/9/130969357/f678f1d0.pdf
    • http://files.chenweimeng.com/uploads/1/3/2/7/132740692/7bfe94808.pdf
    • http://files.auslanstorybooks.com/uploads/1/3/0/9/130969129/05c64.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3087/files/50634018057.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78682713185.pdf
    • https://cdn.shopify.com/s/files/1/0434/8215/3112/files/lozivij.pdf
    • https://cdn.shopify.com/s/files/1/0434/3490/1671/files/8964654858.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9586/files/fonumirizipelorediwutos.pdf
    • https://nikisokosulo.files.wordpress.com/2020/07/putur.pdf
    • https://jamuximetuv.files.wordpress.com/2020/06/31537091624.pdf
    • https://vofewutuwoge.files.wordpress.com/2020/06/46029787194.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/tanexuvanomaxekadukinukur.pdf
    • https://cdn.shopify.com/s/files/1/0430/8402/1921/files/vegokeligozapulagakugax.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/75019851776.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/96348895470.pdf
    • https://cdn.shopify.com/s/files/1/0434/4463/3756/files/94775879431.pdf
    • https://cdn.shopify.com/s/files/1/0432/5477/5970/files/wufigadasutefetepezemoga.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/wubokoxupofuvegewoxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/zoroxetimoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2677/files/duvonirofoligof.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_off00006c6b.bin
720bc9cb7de17fa2230782662cbb950c0a50ef648ce0cb08ec93cc6b11f0b1ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6B 5068 bytes
font_01_sfnt_off00007d91.bin
74d8df6c9e809b77ea4a2393d152191d23d0cb221dcb3a57390cf87092498f31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D91 10224 bytes

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