Malicious PDF — malware analysis report

Static analysis result for SHA-256 137dcc1ac4afc7bb…

MALICIOUS

PDF

40.1 KB Created: 2020-08-06 12:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a03a686688a2db520a923bea70f602fb SHA-1: 6c71ace433adb380107eeec5b32f3972453dbe03 SHA-256: 137dcc1ac4afc7bb1fc5afce717b3850d67b95c786f242b1999c0d9624a8e33b
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm designed to host numerous PDF files. One of the primary links, 'https://ttraff.cc/pify?keyword=alkaline+food+recipes+free+pdf', is flagged as malicious redirector infrastructure. The document body, though heavily obfuscated, contains language suggestive of an advance-fee scam, such as lottery or prize notifications combined with delivery requirements. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.cc/pify?keyword=alkaline+food+recipes+free+pdf
    • http://files.holyangelschicago.com/uploads/1/3/1/4/131412858/votuxudilejorid.pdf
    • http://files.newmontrocksretail.com/uploads/1/3/1/0/131070561/4d88e3c.pdf
    • http://files.stormshannon.com/uploads/1/3/1/8/131856317/rabej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9386/8187/files/tafupapovepulub.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/48434321069.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/rinaze.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/gapewid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mejiwevabefi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.pdf
    • https://cdn.shopify.com/s/files/1/0432/2574/3515/files/dojibikoxewafosaroziboliz.pdf
    • https://cdn.shopify.com/s/files/1/0439/7744/1438/files/how_to_add_font_to_illustrator.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/fodegabazejazafekujodimel.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ed7.bin
7dea0029129495f5f9be59bea9ae4ad0cbaea2ae3ee5585e5121d7f57f5481f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED7 5200 bytes
font_01_sfnt_off0000709c.bin
a686813a4e0b6d1c748e47e882f637a4e347b43a363cbfbc875c57a4bc51139c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709C 10260 bytes

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