Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e6511a58644505…

MALICIOUS

PDF

46.8 KB Created: 2020-07-20 13:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a02b66468d97b0777e88d20173d9c1b SHA-1: ca79dadb1b7c69a9b007ac704831579341c72dea SHA-256: d8e6511a586445055f163412506366867c53c7e775c18ddfea885845282eb38e
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 a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents. The presence of a large number of external PDF links, many hosted on Shopify, further supports the idea of a link farm or distribution mechanism.

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/pify?keyword=graded+exposure+hierarchy+pdf
    • http://files.keithingtonbryant.com/uploads/1/3/2/7/132740700/nodizeweboluje_soseberipoke_fawakiguf.pdf
    • http://files.oldlinereferees.org/uploads/1/3/1/8/131871518/9202653.pdf
    • http://files.revibeyourself.com/uploads/1/3/2/3/132303359/zafunit.pdf
    • https://livasif.files.wordpress
    • https://cdn.shopify.com/s/files/1/0432/4681/3346/files/49114396958.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49893706483.pdf
    • https://cdn.shopify.com/s/files/1/0430/6308/3162/files/13561847642.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1362/files/pokimalifuworobelugedo.pdf
    • https://livasif.files.wordpress.com/2020/07/71731593150.pdf
    • https://potavetuzeva.files.wordpress.com/2020/07/lotetirevozujaka.pdf
    • https://vugerudima.files.wordpress.com/2020/07/524942604.pdf
    • https://bazazexa.files.wordpress.com/2020/06/57769237998.pdf
    • https://miloparewez.files.wordpress.com/2020/07/gesokazu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5423/4785/files/funorubatokuzalu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5109/6984/files/semotutowejebajeva.pdf
    • https://cdn.shopify.com/s/files/1/0436/0149/4178/files/pebasifozisamuzin.pdf
    • https://cdn.shopify.com/s/files/1/0430/4620/7637/files/fikurum.pdf
    • https://cdn.shopify.com/s/files/1/0428/2623/6063/files/20120159773.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/39673618845.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/wepunip.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5813/files/32245261793.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_off00007988.bin
10253cf6d2ae1a95a565e1ff6fac066c0471ac0391c5d353707e1710f58c1426		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7988 5108 bytes
font_01_sfnt_off00008b08.bin
a9e16f6ea0ee266c759fdbfffa42af4010f6f37231796ecfc52246293e0cfba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B08 10072 bytes

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