Malicious PDF — malware analysis report

Static analysis result for SHA-256 234a27702edb28ac…

MALICIOUS

PDF

61.2 KB Created: 2020-07-26 17:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6dbe0b5605a38dcd254bfd08bd63bc0 SHA-1: 6abd0ebcd6bbf7734e9b21c162b266b2623f7ff5 SHA-256: 234a27702edb28ac06ffd752928a1684e55a122b20ceee00f40fe9079125e31e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. It also exhibits a PDF link farm heuristic, indicating a large number of external links, with the primary one leading to a Shopify domain. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a keyword related to a book title, likely a lure.

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/pify?keyword=encyclopaedia+of+islam+first+edition+pdf
    • http://files.platypusandbean.com/uploads/1/3/1/1/131164399/nozes_sizezukez_xixevalu.pdf
    • http://files.billeadsbooks.com/uploads/1/3/2/6/132695636/merefagamupuwaj.pdf
    • http://files.mansurdance.com/uploads/1/3/0/7/130775888/7896543.pdf
    • http://files.hopkintonhistory.org/uploads/1/3/0/8/130873945/zirab-ketivato.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16175378270.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sarozasupevukofapunaxovu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0875/3827/files/sokileb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunumegosuvuvorewufo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kekiwimuzavenomudajelibo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/tolitoloxezibikureretoloz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lozafawofife.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5888/files/piwesizitatejiroto.pdf
    • https://cdn.shopify.com/s/files/1/0434/4276/5976/files/61120730620.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/42523647598.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/5457012243.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/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000baa0.bin
d4e9f7682b1560a07251d53658b56e8a3a93862fc92e5ebb818f190462f323e4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBAA0 25284 bytes
font_00_sfnt_off000084f9.bin
a1a7df8bb3896cd6d27bd56ec00e5f4f2538764a4ce51629e63241ec6c4dec51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F9 5148 bytes
font_01_sfnt_off00009662.bin
80d8c9337752b099d194500c1e958272dbc3717461734e5ea7de198bee276a09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9662 11136 bytes

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