Malicious PDF — malware analysis report

Static analysis result for SHA-256 4995df9b79b63d31…

MALICIOUS

PDF

46.2 KB Created: 2020-07-23 07:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b9ce4f5d6fe1a01db6c3b1260095955 SHA-1: f90e20b8c53e6c1736c5c7eb14f8c79266fe6f81 SHA-256: 4995df9b79b63d31b5ed5f6eed31fdbe30040b96f9408220ea47f3704aaedfaf
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to TurboTax, aiming to trick users into clicking the malicious link. The PDF_SEO_LINK_FARM heuristic further suggests a large number of similar links are being generated, likely for a broad phishing campaign.

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/wb?keyword=turbotax%20federal%20carryover%20worksheet
    • http://files.mslaurenthomas.com/uploads/1/3/0/9/130969689/romuva.pdf
    • http://files.emilyhalbig.com/uploads/1/3/1/3/131398250/nojaxekuwabixoju.pdf
    • http://files.pennjournalconlaw.com/uploads/1/3/2/6/132682694/bawibixijuzawo.pdf
    • http://files.dentalexcellenceindia.com/uploads/1/3/1/3/131380236/1641962.pdf
    • http://files.dentalexcellenceindia.com/uploads/1/3/1/3/13138
    • https://cdn.shopify.com/s/files/1/0431/0243/7527/files/6108864910.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/70353789796.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6240/files/lufesidimerixobakaxeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/6710/5687/files/19054018877.pdf
    • https://xetawebogov.files.wordpress.com/2020/06/79977995117.pdf
    • https://xobezamofud688134818.files.wordpress.com/2020/06/41106521433.pdf
    • https://mabaxopol.files.wordpress.com/2020/07/72998160611.pdf
    • https://kegivisoxibu.files.wordpress.com/2020/07/deredugirirewopuwojeku.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/wukatujemeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5676577217.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7911/files/9183102460.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1465/files/fowotofasepixurave.pdf
    • https://cdn.shopify.com/s/files/1/0432/2420/3424/files/34773840797.pdf
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/kazolubiwesabirewevukilud.pdf
    • https://cdn.shopify.com/s/files/1/0440/9432/4888/files/67691763806.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/giratajolexodomofavewolov.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_off00007561.bin
ed0f72d119b4e7b115bcf18541c37935ae713ff2a1ea3157807fa60067a6b5c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7561 5312 bytes
font_01_sfnt_off000087a2.bin
ff08833acb68d24fe03b00173ea466dffffdf64672881a87dd291cedc332dace		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A2 10564 bytes

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