Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0df38c015bc0dfc…

MALICIOUS

PDF

56.8 KB Created: 2020-08-24 22:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dde28650e3f5c2cbc47339a41b973f8 SHA-1: 3c539b4655ea56c00cf616995eef0c8c522cdfd8 SHA-256: e0df38c015bc0dfcd9033a42564bb180a0d42b2caf6da620f4e738c2f8ce7ba2
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though partially corrupted, contains text suggesting it is an 'online form', which is a common lure for phishing or malware delivery. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK directly indicates the presence of a malicious link, and the ML classifier strongly supports the malicious nature of the PDF. The primary attack vector appears to be directing the user to the malicious ttraff.cc URL.

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.cc/pify?keyword=bsc+bed+online+form+2018
    • http://menajixok.mrsvalenzuela.com/uploads/1/3/1/4/131482853/3537098.pdf
    • http://files.yearofdubois.org/uploads/1/3/2/6/132682851/8033645.pdf
    • http://files.belowthebarkwd.com/uploads/1/3/0/8/130813528/pevurakul-zubafatedojefa-nolidabiset.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/63509027222.pdf
    • https://cdn.shopify.com/s/files/1/0435/5850/2563/files/introduccion_a_la_biotecnologia_vegetal.pdf
    • https://cdn.shopify.com/s/files/1/0459/0531/3946/files/cocker_spaniel_puppy_weight_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/3626/2050/files/49138861309.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/about_me_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/8089/8973/files/wogexilizuja.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/payoff_statement_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2021/files/74053163673.pdf
    • https://cdn.shopify.com/s/files/1/0430/5790/5818/files/54806246552.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7099/files/popotabowodeviwebo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/32256591615.pdf
    • https://cdn.shopify.com/s/files/1/0432/9553/9368/files/difference_between_nsdl_and_cdsl.pdf
    • https://cdn.shopify.com/s/files/1/0435/3599/0936/files/30801140424.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000b5eb.bin
aa4a88a60300220744cdfef5c5b2fd9cb8f05bcec0c0e9ba4c092b98f0f1b2a9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB5EB 10056 bytes
font_00_sfnt_off0000713c.bin
84ffe2089689094fed50627041e66f3e01fe5994c6d9c0ffd2837b116edc7f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x713C 5372 bytes
font_01_sfnt_off00008354.bin
a5324aa261ab696f836984f4042c4920c6fadb3463cef004bb1df54ea584bdb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8354 10764 bytes
font_02_sfnt_off0000a7ea.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7EA 4324 bytes

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