Malicious PDF — malware analysis report

Static analysis result for SHA-256 890132d4b5314ea5…

MALICIOUS

PDF

67.3 KB Created: 2020-08-12 06:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bafe0e0461ba12bea6a142e2d63c290b SHA-1: 882e261bf6f94e6c70107719fa3bf1483141fadc SHA-256: 890132d4b5314ea5fd958fa3360931127eaf3eb5d93e5c2f300ff807f4550fc0
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to 'skewness calculation pdf'. The presence of numerous links to external PDFs, many hosted on Shopify, suggests an attempt to manipulate search engine results or distribute malicious content through a seemingly benign document. No scripts were extracted from this sample.

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.com/pify?keyword=skewness+calculation+pdf
    • http://gasizuk.evanswood.org/uploads/1/3/2/6/132680813/meriwulabemomafog.pdf
    • http://melane.falsefloorcreative.com/uploads/1/3/2/8/132814930/puzuwesi.pdf
    • http://files.pcqc.org/uploads/1/3/1/4/131452842/6263829.pdf
    • http://files.milehighaussies.com/uploads/1/3/1/0/131070611/mazakeb.pdf
    • https://cdn.shopify.com/s/files/1/0439/2534/0328/files/kogakofopugolula.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/88340709499.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/xomojuwuvug.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/nubebizeboxamutar.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/53847398947.pdf
    • https://cdn.shopify.com/s/files/1/0429/7195/5351/files/tigimibijit.pdf
    • https://cdn.shopify.com/s/files/1/0433/9164/7894/files/ocr_a_level_chemistry_textbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/0609/8597/files/ramuvanefonajokamozudu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3573/files/gexavewetesaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/figarawevig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46676539889.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/33370327755.pdf
    • https://cdn.shopify.com/s/files/1/0447/0787/2921/files/panasonic_phone_manual_kx-_tgea20.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000096b2.bin
6fd4c3c7aa2a7d7e1e59565c0406cbc1c772ce5301145645cb323105dd9fdece		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96B2 5196 bytes
font_01_sfnt_off0000a87e.bin
c59cf5fad4f262b33b9756816600526e6eb8706405c30c159f0629b33ff30036		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA87E 16656 bytes
font_02_sfnt_off0000dd06.bin
1396562ca3b520584892f4bd50ff39b0722e014cdbc1625119a677b71e1270af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD06 16064 bytes
font_03_sfnt_off0000f1aa.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 4324 bytes

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