Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c4dc1f6c9248c8…

MALICIOUS

PDF

47.1 KB Created: 2020-08-01 18:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e60402124da0daaf2ee90897954457b SHA-1: d1c61442319ea2ed1dc8516c9e0a7060e9584854 SHA-256: b6c4dc1f6c9248c89ce88e9b477314c0d6359c51b9f5f2fc73e56be83739efdd
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, includes the URL 'https://ttraff.cc/pify?keyword=baixar+possuida+2', which is flagged as malicious. Additionally, numerous links to Shopify-hosted PDF files are present, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness.

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=baixar+possuida+2
    • http://files.4lifeinc.org/uploads/1/3/2/7/132710756/silovibuxuwibonepam.pdf
    • http://files.coljonesswimhurstville.com.au/uploads/1/3/0/8/130814382/da961c8.pdf
    • http://files.braveguinevere.com/uploads/1/3/2/3/132302921/3174725.pdf
    • http://files.phfabrication.net/uploads/1/3/0/7/130740589/kuzefafabiz-difojumukad.pdf
    • http://files.joanridsdel.com/uploads/1/3/1/3/131380773/mesexezajiz_waxag_zowejufafere.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/2007826840.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1142/files/15645088853.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/tesulorora.pdf
    • https://cdn.shopify.com/s/files/1/0432/6408/2073/files/48539576473.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/dugudutovakoluva.pdf
    • https://cdn.shopify.com/s/files/1/0432/6853/8521/files/vobaka.pdf
    • https://cdn.shopify.com/s/files/1/0430/0131/5491/files/1770368305.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/36126876704.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/94616739583.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/38649769150.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/53586418092.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/97646060434.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/76473731513.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ac4.bin
d03e7eb38fcbcf29f60efeea7437326bc3df13f65b3b9d4cee21975d694497ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC4 4748 bytes
font_01_sfnt_off00007aea.bin
e3ee2234e238842fcead72b4c220c4f28174c621a23958e0ab986c16d90853e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEA 12032 bytes
font_02_sfnt_off0000a024.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA024 4324 bytes

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