Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7445249b3568b2c…

MALICIOUS

PDF

43.6 KB Created: 2020-08-03 16:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27c0069e4981e06e11abf91071b9c754 SHA-1: 30ab447a6f19ea34527371afc9eaa152d8e4ef96 SHA-256: e7445249b3568b2c0d5783216b5a30b7422cea0088e6073f626002ea4f0dc9b3
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files, likely hosted on Shopify. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword related to ASTM E84 standards, suggesting a lure for users searching for this information.

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=astm+e84+pdf
    • http://files.paperchasewholesale.com/uploads/1/3/2/7/132741029/wuwufexu.pdf
    • http://files.werbrave.com/uploads/1/3/2/7/132740482/sokatonujitew_xepixerir_vewanasujun_lulovanexeg.pdf
    • http://files.pepeandnixi.com/uploads/1/3/0/8/130813696/dinoborama.pdf
    • http://files.mayacamasfinefoods.com/uploads/1/3/2/7/132740814/latilo_pemuvon_zalokele.pdf
    • http://files.spearfishspartanwrestling.com/uploads/1/3/1/6/131636954/tobedezijojofa.pdf
    • https://cdn.shopify.com/s/files/1/0438/2674/1405/files/ams_2430.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8136/files/20121695504.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/fisewekuranazimiwufaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/4997/5959/files/65331308385.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/dajezofobizisufilibonoje.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/rivejofupunazosugawa.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1715/files/mogifivusiwisu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9285/9293/files/bedoxilaset.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3399/files/tekujuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/50595190074.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/karolidozebarotavojele.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_off00006d54.bin
8c250ac78b5eb9dc04bbcc302d4a33732db38a47590c2b217aaafe9f5b8169f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D54 5120 bytes
font_01_sfnt_off00007ec5.bin
3d415fd8e477f156cb0cc20b01ebeab7b77e4160cdd7efd05b5fbc2f8d949c9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC5 10232 bytes

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