Malicious PDF — malware analysis report

Static analysis result for SHA-256 b943207159690128…

MALICIOUS

PDF

52.1 KB Created: 2020-09-06 20:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0d832ca7c81c5eeadcadd92461000a0 SHA-1: 7da5843b5e765a97a8ab8295e5aaf12efcd83668 SHA-256: b94320715969012890ab5116f625834ba6c4991ba4ea8ea869ff904f4f3e859b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. The primary malicious link redirects to `ttraff.club`, a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to contain junk data, but the presence of the malicious URL is the primary indicator of compromise.

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.club/wix?keyword=disney+princess+piano+sheet+music+pdf
    • https://cdn.shopify.com/s/files/1/0432/1617/5263/files/19741688395.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdf
    • https://cdn.shopify.com/s/files/1/0432/7935/1976/files/kisesumajexasedasoz.pdf
    • https://static.usrfiles.com/ugd/65b209_0d3e2495624c4b2f96494f70cb6f0764.pdf
    • https://static.usrfiles.com/ugd/8acad3_05b8b2aaeb2c4539824ac0c97fe00735.pdf
    • https://static.usrfiles.com/ugd/cfa91a_48dbd791e4a34a6eaa23ab3f3c6dc772.pdf
    • https://static.usrfiles.com/ugd/21b4a7_71c259ebcaa24d3aa2f62ce83bd6d9b9.pdf
    • https://static.usrfiles.com/ugd/3801ff_36bbb35ee2b14808b0c3760beab607b3.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5261/files/38739589942.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/arpegios_para_guitarra_clasica.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/protocolo_aplasia_medular.pdf
    • https://cdn.shopify.com/s/files/1/0448/2197/1104/files/bubbler_system.pdf
    • https://cdn.shopify.com/s/files/1/0438/4070/0578/files/muxerimonubep.pdf
    • https://cdn.shopify.com/s/files/1/0440/3917/6342/files/maduruvabawotupifanul.pdf
    • https://cdn.shopify.com/s/files/1/0437/6405/6225/files/genipadezab.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6949/files/understatement_penalty_guide_sars.pdf
    • https://cdn.shopify.com/s/files/1/0431/8740/4968/files/44110752041.pdf
    • https://cdn.shopify.com/s/files/1/0435/8170/2303/files/92568183078.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_off000078ae.bin
0ddfd90a6e6c6a729578a289ddfaf0094a6e3b65fdfdd869aedbae4b45d6d941		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AE 5464 bytes
font_01_sfnt_off00008b25.bin
2f1bd5c359643775e59215a81bdb4c7f97c6ba8f96301e0503a9bfc36087b537		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B25 10156 bytes
font_02_sfnt_off0000ae1f.bin
84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1F 16100 bytes

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