Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d57c2c49cbff109…

MALICIOUS

PDF

48.6 KB Created: 2020-08-30 05:39:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24387edf18174f51c4e2f7f12bad1494 SHA-1: a934537e61fa3022fe3919b71ca92bf559aae806 SHA-256: 5d57c2c49cbff109f2aa6537074c8f9ac7922959be048bff9e2e75f7a370cf65
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure via ttraff.com. The document body, though heavily obfuscated, contains references to the 'intersecting chords theorem' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous external PDF links further supports the SEO link farm heuristic.

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.com/wix?keyword=intersecting+chords+theorem
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0462/2299/9706/files/xewis.pdf
    • https://cdn.shopify.com/s/files/1/0433/7054/5308/files/pibekanelopapokemiwot.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/netamelejuxekopivob.pdf
    • https://static.usrfiles.com/ugd/b8c837_126fc4e8036b4a018433c4911e9352bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5267b53193c413aad1ec56b7ba37177.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b0978d96f8c45b39f765347f84a02ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0f034a21b39484ca9803036e72f6feb.pdf
    • https://static.usrfiles.com/ugd/5cf23b_7836249d19ed4a5eb84895b53843518a.pdf
    • https://cdn.shopify.com/s/files/1/0434/6131/2664/files/10587449672.pdf
    • https://cdn.shopify.com/s/files/1/0435/2484/9815/files/87906244291.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9738/files/wedanulajalajol.pdf
    • https://static.usrfiles.com/ugd/9c0842_22a971358ca64ceebe2f2cfa4893b32c.pdf
    • https://static.usrfiles.com/ugd/b8c837_04441d11a284475b909021614dadf60f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a644aabf54cd4891aee24555feb8c015.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068dd.bin
7006413bcd25879c4d1f29dff5d6edb14247d91fe74666a86fbbc2d62e7e5aa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DD 5048 bytes
font_01_sfnt_off000079d6.bin
7af773f263f6a0786b9332264fa502291d4c4f8fe9ba43718422490c67ab32ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D6 10352 bytes
font_02_sfnt_off00009d8d.bin
d92888f46ba6b066d84d7d20b47c4a5d2dd7c8372f2002125f8c75e948d8698f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8D 16368 bytes

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