Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc51468339946af…

MALICIOUS

PDF

36.5 KB Created: 2020-08-18 22:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3ca45bc773d4215a604646ff75d4600 SHA-1: 1b7698bd3fda14045745159a88ed7888a0058261 SHA-256: cdc51468339946af35b1cacd3208b756ec9e4f9ca3db1aca97576e1f5b021507
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link to a known malicious redirector, ttraff.com, which is disguised as a download for 'Citra emulator apk aptoide'. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, likely for SEO manipulation or to obscure malicious intent. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=citra+emulator+apk+aptoide
    • http://vikuvux.patanjali-yoga.info/uploads/1/3/0/7/130739625/tusufil_lulalapamu.pdf
    • http://files.sclegendsvbc.com/uploads/1/3/1/4/131438784/falekefiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/9725/0205/files/bobuwulelixel.pdf
    • https://cdn.shopify.com/s/files/1/0448/0640/6295/files/62806445773.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8918/files/nomenclature_functional_groups.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/jezarubo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4044/8407/files/duzodifixigajoluk.pdf
    • https://cdn.shopify.com/s/files/1/0433/2231/0811/files/zosufadaxizidoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8328/4136/files/senior_electrical_engineer_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/7378/8321/files/51423510291.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/lavipi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3366/files/28747875236.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5749/files/adam_smith_division_of_labor.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/kiwegibon.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005381.bin
6888d8c4c8670f6921c891ca2ff0fc49eb48e532fcc904a6c41c600cfb64ca4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5381 4896 bytes
font_01_sfnt_off00006408.bin
c002bf0bf24c1d47385988c9abcd8803f06fe31466406d895d132cc366ada995		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6408 9744 bytes

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