Malicious PDF — malware analysis report

Static analysis result for SHA-256 8084a03218f1888c…

MALICIOUS

PDF

42.5 KB Created: 2020-08-08 10:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9b3f80dd29aebf554636a3827c54767 SHA-1: 8da5e608297a1df09233bd9ae998f92dbb25d156 SHA-256: 8084a03218f1888c68cc3dd518aeb94d00eb4e8ec7c32e409908d478e3639c0d
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary malicious URL is https://ttraff.com/pify?keyword=august+month+current+affairs+pdf+gradeup. The document body, though heavily obfuscated, contains this URL and numerous other PDF links, consistent with SEO poisoning or link farm tactics. No scripts were extracted, limiting the analysis of direct payload execution.

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.com/pify?keyword=august+month+current+affairs+pdf+gradeup
    • http://files.fotoartbyvincent.com/uploads/1/3/0/7/130775249/1737804.pdf
    • http://files.lotusandlaurelyoga.com/uploads/1/3/1/4/131452883/7497087.pdf
    • http://files.stmichaelslc.com/uploads/1/3/0/8/130874358/gujowuvakonupikuwix.pdf
    • http://files.stephenwitkin.com/uploads/1/3/0/7/130775306/vavasefakobopu.pdf
    • http://zejiforat.fyiexpress.com/uploads/1/3/1/6/131637814/jukat_lowopilemuruseb_rugajari.pdf
    • https://cdn.shopify.com/s/files/1/0434/8562/6520/files/xevelosese.pdf
    • https://cdn.shopify.com/s/files/1/0435/4739/4199/files/do_the_harlem_shake_trick.pdf
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/goweboruvol.pdf
    • https://cdn.shopify.com/s/files/1/0428/1293/2255/files/wetafisuromo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/78757295321.pdf
    • https://cdn.shopify.com/s/files/1/0428/5690/6918/files/vumovalikujaboruv.pdf
    • https://cdn.shopify.com/s/files/1/0437/2434/1400/files/80239043982.pdf
    • https://cdn.shopify.com/s/files/1/0440/6332/6358/files/81968630711.pdf
    • https://cdn.shopify.com/s/files/1/0436/3950/5056/files/learn_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0438/6629/2389/files/29893754354.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6008/files/3343581987.pdf
    • https://cdn.shopify.com/s/files/1/0431/7619/8305/files/ferizufebajakunetegesir.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/netuxujukinofedizekonid.pdf
    • https://cdn.shopify.com/s/files/1/0435/8216/1053/files/oil_seal_cross_reference_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/jokeputavokigokawu.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_off00005870.bin
e6c69e12b761745494dea4aef683eba415ac118f842f01a7c08483eaab4c1ec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5870 5408 bytes
font_01_sfnt_off00006a9e.bin
55f631d57354af0ddd9d3512ba96ee331e628352f82576cfc598445dd1c89246		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9E 10548 bytes
font_02_sfnt_off00008ead.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAD 4324 bytes

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