Malicious PDF — malware analysis report

Static analysis result for SHA-256 a593ab9d2ac35608…

MALICIOUS

PDF

55.2 KB Created: 2020-08-18 23:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee2c287b87be0456783aea5373f2f13b SHA-1: 3eb4ec5906a2aa309da960772f9b68f2d84c9ae3 SHA-256: a593ab9d2ac35608e884abe75980f082da486976222c37396fa1f43615e5c177
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to a redirector service. The primary malicious URL identified is https://ttraff.ru/pify?keyword=basset+fauve+de+bretagne+breed+information, which likely serves as a gateway to further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the lure.

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.ru/pify?keyword=basset+fauve+de+bretagne+breed+information
    • http://files.cabsmatters.com/uploads/1/3/1/3/131383575/puvudun.pdf
    • http://files.flexgangent.com/uploads/1/3/1/1/131163723/sawatomajope-diloxedi-joraxoguledebo.pdf
    • http://files.peakcollegeconsulting.com/uploads/1/3/1/3/131398142/meweritajosiz-nutidotute-pemaxiluloj.pdf
    • http://files.mychairspins.com/uploads/1/3/1/6/131637190/wonod.pdf
    • http://gobema.baretablecatering.com/uploads/1/3/1/4/131406390/433cae793.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/1413161657.pdf
    • https://cdn.shopify.com/s/files/1/0427/4287/4278/files/lalav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97897646990.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2568/files/3843235761.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/5848183308.pdf
    • https://cdn.shopify.com/s/files/1/0438/6953/6411/files/44908737976.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66541571973.pdf
    • https://cdn.shopify.com/s/files/1/0435/0722/0635/files/carnet_de_voyage_paris.pdf
    • https://cdn.shopify.com/s/files/1/0432/7260/1756/files/76668040887.pdf
    • https://cdn.shopify.com/s/files/1/0435/5883/0231/files/cold_blood_valen.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/bangladesh_passport_reissue_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/artists_rethinking_the_blockchain.pdf
    • https://cdn.shopify.com/s/files/1/0447/7508/0087/files/51711566468.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9199/files/factors_affecting_cognitive_development_of_child_and_adolescent.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_off000099a5.bin
753823128fb79927d70904743e7540dbcd03f1725324021e2ab5cd1227b67167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99A5 5444 bytes
font_01_sfnt_off0000ac13.bin
eeea11940eba262d15678dc452007bfae8248f690fb3c3fa3c0141e6fd7a4103		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC13 10332 bytes

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