Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0e60d5e520dceb…

MALICIOUS

PDF

55.7 KB Created: 2020-08-07 03:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca5b38f9615feaf4703fc39e83edf5d4 SHA-1: a17c88e32189814c1b33a4bd44556c15888836fd SHA-256: bf0e60d5e520dceb2bd970e4e0fcf7dfdfeae076219ef2dcaf5c66968d3e1e23
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding a large number of external links. One critical heuristic identified a link to a known malicious redirector service, ttraff.ru, which likely serves to obscure the ultimate malicious destination. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of links and the presence of a redirector suggest a phishing or malicious redirection attempt.

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.ru/pify?keyword=straddle+injury+adalah+pdf
    • http://files.ttranlandscaping.com/uploads/1/3/1/8/131856672/41ec83.pdf
    • http://gixev.flex-sander.com/uploads/1/3/0/9/130969358/tiwuruner_pezaxumevibedel_kapore.pdf
    • http://files.rehobothconcertband.org/uploads/1/3/0/7/130775309/zireju.pdf
    • http://files.athensvideo.net/uploads/1/3/0/7/130776420/eec0ebb88bb0f.pdf
    • http://files.fairygrasshopper.com/uploads/1/3/2/7/132741110/7d541fc.pdf
    • https://cdn.shopify.com/s/files/1/0432/9517/8902/files/java_equals_vs.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/zamototenixubogifi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3028/0352/files/39940936235.pdf
    • https://cdn.shopify.com/s/files/1/0438/9833/9496/files/53833242188.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/bugowazevutazivuvazofu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9383/5432/files/3039970121.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/ziwosuxajotixodivubuza.pdf
    • https://cdn.shopify.com/s/files/1/0428/4717/4822/files/rutuvixagelalebaluliza.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/87622471135.pdf
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/vivotokitalus.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
stream_005_off000083f5.bin
f2b13a378e224926dea5f2fb6d7fa943953d57448619a146151cc83439f4e1d8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x83F5 14124 bytes
font_00_sfnt_off0000722a.bin
9edbee9c4a18a5632c043ce4810d594d8ba4d44c4d597682f64b57ae0ceadd30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x722A 5232 bytes
font_02_sfnt_off0000ab72.bin
25585d256a63b9a3ffeb5d818dc481b470cddcac1e7140de5e6740926e58dee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB72 10716 bytes

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