Malicious PDF — malware analysis report

Static analysis result for SHA-256 74bc59b60e8d1107…

MALICIOUS

PDF

47.1 KB Created: 2020-07-30 20:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ae7f47e5660e6d940bc7998c4e0093f SHA-1: efaf205b32ce83c30f7534af7c4957ce00f442c7 SHA-256: 74bc59b60e8d110705b6e51cf1111a13b68e9b0acd86feb22d435a0a8ac25b3e
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.com, disguised as a search result for academic information. This indicates a phishing or scam attempt. The ML classifier strongly supports the malicious nature of the PDF. The document body, though heavily obfuscated, contains text related to the lure. The presence of numerous embedded links to external PDFs, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility.

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=bnmu+part+3+result+2020+pdf
    • http://files.brandjourno.com/uploads/1/3/2/6/132695525/9323520.pdf
    • http://files.sneakerempireorange.com/uploads/1/3/1/4/131483371/bakutiji.pdf
    • http://files.guarddogsurveillance.com/uploads/1/3/1/6/131606815/tapiviw-giragupobimesa-nidixibi.pdf
    • http://files.petersoncounseling.org/uploads/1/3/0/7/130739937/dobapuru.pdf
    • https://cdn.shopify.com/s/files/1/0428/2292/6492/files/83108226302.pdf
    • https://cdn.shopify.com/s/files/1/0432/0755/7275/files/zobodakaviboxanisi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0832/6812/files/lepakegatut.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/mimodutalezudinop.pdf
    • https://cdn.shopify.com/s/files/1/0434/9234/3970/files/dogitimotapananafoximiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/85563012049.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/20902720792.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/puxubogozetolixon.pdf
    • https://cdn.shopify.com/s/files/1/0438/6104/9494/files/tugivel.pdf
    • https://cdn.shopify.com/s/files/1/0433/4603/4853/files/99064329129.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/lamijoduruzi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3071/6322/files/xazid.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/
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/mimodut

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007aab.bin
29313ec4d7a68118fda3a7c71f93b7fbf021e1ff7ccc3cc0e398e5557332fd57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAB 5400 bytes
font_01_sfnt_off00008cdb.bin
ce02cc68af67b9fb92e8a3b0c3afa98a65032d05a3b242e398c715ece29e233a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDB 9984 bytes

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