Malicious PDF — malware analysis report

Static analysis result for SHA-256 81cd4d28f4ff111b…

MALICIOUS

PDF

46.1 KB Created: 2020-08-08 22:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18630d57b40256a45cd3efcec6d85590 SHA-1: cd8e9a6de2dba8e68322c370e42f62a362985f46 SHA-256: 81cd4d28f4ff111b6b6066462286776ab45aea8d35e04ec27b3c80db3555da22
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One prominent link, https://ttraff.ru/pify?keyword=vehicle+blackbox+dvr+manual+pdf, is flagged as a malicious redirector. The document body, though partially corrupted, also contains this URL, suggesting an attempt to lure users to malicious infrastructure under the guise of providing a manual.

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=vehicle+blackbox+dvr+manual+pdf
    • http://files.sgdollcarnival.com/uploads/1/3/1/4/131454024/tiropepav.pdf
    • http://files.littlelamblearners.com/uploads/1/3/1/8/131856852/zuvoweron_gutegu.pdf
    • http://files.woodsthingstreefarm.com/uploads/1/3/1/3/131381518/bewopoxobajo-vonero-mudab.pdf
    • http://files.hedgieloving.com/uploads/1/3/1/4/131453247/4497587.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3463/0554/files/xurewedevadiki.pdf
    • https://cdn.shopify.com/s/files/1/0436/5962/4606/files/texegitole.pdf
    • https://cdn.shopify.com/s/files/1/0428/0506/7943/files/xukutabizawoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/2935/6959/files/22629151215.pdf
    • https://cdn.shopify.com/s/files/1/0431/9471/2228/files/81104274992.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/beginning_letter_sounds_cut_and_paste_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/1995/2550/files/13591378967.pdf
    • https://cdn.shopify.com/s/files/1/0433/9177/8965/files/bowobu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0805/7759/files/bobitidom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67641838088.pdf
    • https://cdn.shopify.com/s/files/1/0429/6740/0601/files/69705096321.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/31541476183.pdf
    • https://cdn.shopify.com/s/files/1/0428/2921/7958/files/90094544323.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055fa.bin
eaaa80f29b999766df912ea2be5bbb9d08ab2fdadd8334b8470eff021c12082e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55FA 9384 bytes
font_01_sfnt_off00007510.bin
80b04a64bc2858db5001ce2dff9d248803bf9eb024ea682f035720c671e66711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7510 5512 bytes
font_02_sfnt_off000087b1.bin
985db977f6b3903c646f069409d8f448e71808ca8bf68e8ba153e0b4b78d30c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87B1 10348 bytes

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