Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7dc654fa7ac1a2…

MALICIOUS

PDF

56.0 KB Created: 2020-08-07 09:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a61e4fe94f0525a3131f5604c94f904 SHA-1: c6b0d53f67c099515fc9eb330e7ad4b42346f2c4 SHA-256: 5b7dc654fa7ac1a2c5485bfde07a5f12cde900023bc67bcce2563feb82d4b2f5
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.com/pify?keyword=makalah+energi+biomassa+pdf', is flagged as a malicious redirector. The document body itself is heavily obfuscated but contains references to the same malicious URL, indicating an attempt to drive traffic to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=makalah+energi+biomassa+pdf
    • http://pozurab.emeraldacresaldergrovebc.com/uploads/1/3/1/8/131856772/jupemojib-figovudizag-koronakirel.pdf
    • http://files.walkamilebrainerdbaxter.com/uploads/1/3/2/7/132741322/depako.pdf
    • http://files.nuplanetreestudent.com/uploads/1/3/1/3/131398144/xegasiz_pimegimokefini_xikejesi.pdf
    • http://files.mrsramosvirleysartclass.com/uploads/1/3/0/8/130874120/turolodali_fivetemem_xapedonigapi_nexunure.pdf
    • http://files.rootsdesignco.com/uploads/1/3/1/3/131398401/1255625.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/4855/0050/files/88410641068.pdf
    • https://cdn.shopify.com/s/files/1/0428/9373/8143/files/55746889927.pdf
    • https://cdn.shopify.com/s/files/1/0434/4319/1969/files/kesuzazedufedajiluxorew.pdf
    • https://cdn.shopify.com/s/files/1/0434/6229/5714/files/77536709763.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94229011204.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/zareg.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/35242541713.pdf
    • https://cdn.shopify.com/s/files/1/0434/4021/0072/files/nedesotodabagamefu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3733/files/zexepeguxuzomi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0636/0730/files/rukijepitilodajelewo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2331/8686/files/28233412670.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/subosurujotawexavosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/13800509740.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f70.bin
142cc381ebf498a69eea5bc7d342900bfe9d8a0e619948e80941f513f3f6659f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F70 5372 bytes
font_01_sfnt_off0000a16f.bin
1cdb4fe273bc3e1fcbf97e711c0e110a62a3c78e3ff7f49a475b40cc8f86f843		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA16F 10304 bytes
font_02_sfnt_off0000c491.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC491 4324 bytes

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