Malicious PDF — malware analysis report

Static analysis result for SHA-256 8838cfc66f7186ca…

MALICIOUS

PDF

39.7 KB Created: 2020-08-06 02:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b2f1268e80f7b4bbb491c65b1226b35 SHA-1: a4927646fe101205984a6b29c5c3f07185d7512c SHA-256: 8838cfc66f7186cac053e9b56c55d36ae6b7ada693d14b312a8088a5500d56cd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which are identified as part of a link farm and point to a known malicious redirector. The primary malicious URL is https://ttraff.cc/pify?keyword=mapa+metro+rj+pdf, which is designed to lure users into downloading further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=mapa+metro+rj+pdf
    • http://files.pbcwv.net/uploads/1/3/0/7/130739544/7291778.pdf
    • http://files.publichealthmuseum.org/uploads/1/3/1/3/131384789/a826b1b39.pdf
    • http://files.healthafter40.blog/uploads/1/3/0/7/130775983/3470811.pdf
    • http://zotibaka.wrkimages.com/uploads/1/3/2/7/132710780/445233.pdf
    • http://files.spectra-simulator.com/uploads/1/3/1/6/131637919/mirapibulofa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/septic_abortion.pdf
    • https://cdn.shopify.com/s/files/1/0435/2920/7957/files/piazzolla_adios_nonino_tango_rhapsody.pdf
    • https://cdn.shopify.com/s/files/1/0438/1632/1184/files/vigivibabizujidatagijen.pdf
    • https://cdn.shopify.com/s/files/1/0430/6396/7906/files/73745371750.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/44096451197.pdf
    • https://cdn.shopify.com/s/files/1/0437/7985/0391/files/mopurewilasefet.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/12138504859.pdf
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/84866220583.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/runomelolelivumuteni.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8197/files/2768549237.pdf
    • https://cdn.shopify.com/s/files/1/0428/9111/6700/files/jikivakegepib.pdf
    • https://cdn.shopify.com/s/files/1/0437/4410/0506/files/giraxo.pdf
    • https://cdn.shopify.com/s/files/1/0446/7628/4569/files/6th_grade_social_studies_worksheets.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_off00005ce4.bin
17f8e4a2ae0ece47cebbc728390651d863404312c32d20a4da05b95943138b3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE4 5056 bytes
font_01_sfnt_off00006e0e.bin
ec061f799747f08ffc80cd635cee0e329667167d3c30979a27c60cbbe4aa2bd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0E 10732 bytes

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