Malicious PDF — malware analysis report

Static analysis result for SHA-256 d729cc031d44c063…

MALICIOUS

PDF

42.0 KB Created: 2020-08-07 02:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b18b94f7656390e34c1c489458b0a5cb SHA-1: 795914c0dbeb095682bce2463748b7a11c4712e7 SHA-256: d729cc031d44c0637d11d94252f127640a014d80e09d55952244b8253706f3f2
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body text, though partially corrupted, suggests a lure related to free PDF assembly tools. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a social engineering attempt to drive traffic to malicious infrastructure. No scripts were extracted, but the primary attack vector appears to be the redirection to external malicious URLs.

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.cc/pify?keyword=comment+assembler+des+pdf+gratuitement
    • http://files.sigmaalphalsu.com/uploads/1/3/1/3/131378952/b8ae82d9.pdf
    • http://files.threadsolelife.com/uploads/1/3/1/4/131438128/1e8a94f895.pdf
    • http://files.outerreefjewelry.com/uploads/1/3/2/6/132680853/tuwejuf_rebekirar.pdf
    • http://files.mybestmake.co.uk/uploads/1/3/1/8/131871740/sozuzidexilelu.pdf
    • http://files.buckeyebulldogclub.com/uploads/1/3/1/6/131636834/xapofimorumo-kizasunukax-dikazolerexipos-fivexoju.pdf
    • https://cdn.shopify.com/s/files/1/0438/3683/3954/files/kulekupajatureriferalojo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8850/files/lodish_molecular_cell_biology_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/t_shirt_cutting_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0438/5511/8501/files/nabamabu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2978/1918/files/58075637756.pdf
    • https://cdn.shopify.com/s/files/1/0433/8873/1543/files/wheel_of_misfortune_neopets.pdf
    • https://cdn.shopify.com/s/files/1/0428/3724/6118/files/kajufawetunadexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/3476/2654/files/36398008831.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/xifakakolaxit.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_off000061a1.bin
c7a13bc01692cd0a8e441985c1db3e1416f7f50d59b8a44bca40c24c4dd7d315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A1 5404 bytes
font_01_sfnt_off000073dc.bin
870a62166fb80910cd943eab68ba32e7c454c2fb5e6014b434309c41977a0be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73DC 11700 bytes

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