Malicious PDF — malware analysis report

Static analysis result for SHA-256 d815427da08f8072…

MALICIOUS

PDF

47.4 KB Created: 2020-08-07 01:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10849ac71bd4e27fc59b116640292d65 SHA-1: fbbca6c4fd759277b268b015e624a765031dd129 SHA-256: d815427da08f8072735b43c6cd85116ac0306912856e9ae0c43c505252045da1
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary redirector URL being https://ttraff.ru/pify?keyword=biotina+esmalte+pdf. This indicates a link farm or redirection attack designed to lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body text is heavily obfuscated and appears to be mostly binary data, making it difficult to ascertain the exact lure, but the presence of numerous links points to a phishing or redirection 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.ru/pify?keyword=biotina+esmalte+pdf
    • http://files.andrewcareyphotography.com/uploads/1/3/0/7/130738681/321cb0e95942.pdf
    • http://files.power-up-potential.com/uploads/1/3/1/3/131379875/foludajijeduj.pdf
    • http://files.muyoungcho.com/uploads/1/3/1/8/131856050/jirijejodu.pdf
    • http://files.lindsay-hamilton.com/uploads/1/3/0/7/130740524/06a9d0d85.pdf
    • https://cdn.shopify.com/s/files/1/0435/3287/7976/files/87803729637.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0435/files/zivafapixi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/85284286486.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8387/files/tet_psychology_books_in_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4114/4483/files/three_syllable_words_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/xipisiwut.pdf
    • https://cdn.shopify.com/s/files/1/0436/0437/7763/files/vusimelegejupi.pdf
    • https://cdn.shopify.com/s/files/1/0438/1959/7981/files/consumer_buying_behavior_theory.pdf
    • https://cdn.shopify.com/s/files/1/0432/3174/0066/files/lufevival.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nakawefefaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065a3.bin
0f85043550529b0fb2cb27ad05586fc886cba29469561549327abbdee7380ed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A3 5140 bytes
font_01_sfnt_off00007714.bin
5677f4331e1fea2862aab309ec05259279309150af2c610f6793d1d149deb99a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7714 10684 bytes
font_02_sfnt_off00009bd4.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD4 16092 bytes

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