Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfb1f76ae65555f…

MALICIOUS

PDF

42.9 KB Created: 2020-08-09 15:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 734d0249a35c8a2929a1aa28da1a0a4b SHA-1: 6f7a908e4999428d821b185ea803661adad344ac SHA-256: 0dfb1f76ae65555f0f257a359d9eec79f4233533e2d714113b1a553fd364d6df
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to generate SEO traffic. One of the primary links, 'https://ttraff.cc/pify?keyword=cerita+rakyat+malin+kundang+pdf', is a known malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure itself is suspicious for hosting such a large number of external links.

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=cerita+rakyat+malin+kundang+pdf
    • http://tatolaf.jollygeographer.com/uploads/1/3/0/9/130969368/5366887.pdf
    • http://files.michelehauser.com/uploads/1/3/1/4/131438046/e031ba8f667fccb.pdf
    • http://vubew.farragutrobotics.org/uploads/1/3/0/9/130969352/fenizaliparon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/1859/8038/files/61912790211.pdf
    • https://cdn.shopify.com/s/files/1/0429/4744/4903/files/kejiforumo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6650/files/learn_acoustic_guitar_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/72711271168.pdf
    • https://cdn.shopify.com/s/files/1/0430/7917/2257/files/15169171556.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1040/files/78283663198.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/88353987741.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/xalera.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/46289303182.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/48475612516.pdf
    • https://cdn.shopify.com/s/files/1/0428/8790/5446/files/zoboxonuvibugoba.pdf
    • https://cdn.shopify.com/s/files/1/0438/5056/3734/files/3991436042.pdf
    • https://cdn.shopify.com/s/files/1/0433/4354/4488/files/jcb_backhoe_loader_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/7741/0720/files/moxipagutuwuwilogob.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_off00006a4f.bin
82c7f1f55e04cf6e2c8b7f0d90f7cbbeee752b28aac31f6c4e6cfb2d61b3a112		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4F 5252 bytes
font_01_sfnt_off00007c2a.bin
181e267434e5a5d70fe76387ff9a3339fa507d65cfaede24e1ffcac75281ffab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2A 10128 bytes

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