Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c29b9c7c127591…

MALICIOUS

PDF

44.6 KB Created: 2020-07-31 18:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2641fdaf5c5fd42dfba759efbc8e52b2 SHA-1: c4931784aeb5f903c9f1361f61d095054f161a74 SHA-256: 21c29b9c7c127591d334c032d0110811761f623b071b27b8f0a478f55c7894d7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=toshiba+boot+from+usb'. The document body, though heavily obfuscated, contains text related to 'Toshiba boot from usb', suggesting a lure to trick users into clicking the malicious link. 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.com/pify?keyword=toshiba+boot+from+usb
    • http://files.viewpointvideos.com/uploads/1/3/1/6/131606256/0947b7.pdf
    • http://files.laryssachan.com/uploads/1/3/0/7/130775784/memikelupira.pdf
    • http://files.parlorhairboutique.com/uploads/1/3/0/7/130776067/depopufokexefu_bifijemi_venetoxasoxuna.pdf
    • http://files.dehoniansocialjustice.org/uploads/1/3/1/1/131164020/tejaj.pdf
    • http://files.laurenkimak.com/uploads/1/3/1/0/131069992/tosutupesuwedib-joliti.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/94210773121.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/81148283227.pdf
    • https://cdn.shopify.com/s/files/1/0432/5556/2398/files/dufekebirabedasalufexirub.pdf
    • https://cdn.shopify.com/s/files/1/0432/7686/1606/files/mafixujofekijigokig.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/88716273565.pdf
    • https://cdn.shopify.com/s/files/1/0433/8781/4044/files/29545358279.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3561/files/kavudoboxabu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3591/8489/files/42553314841.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/putovuravipemigekobig.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/selolaretilitigejov.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7962/files/39677204310.pdf
    • https://cdn.shopify.com/s/files/1/0431/3910/4917/files/zadovesovujokobowobupovo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1855/0439/files/guxakatoxibi.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_off000072c2.bin
1fbdb65555cbc2310f462af884e96fd72e57a9a14511e854c3c6b28789a2c43d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C2 5064 bytes
font_01_sfnt_off000083ce.bin
e13d07298046c5735756162b3a6f8a82acab0510b8eb0c48273613ca5b1ad5ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83CE 9932 bytes

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