Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf7bcdc2869c976…

MALICIOUS

PDF

58.9 KB Created: 2020-08-11 18:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9882e4d28cc593b694236e513ba5f75 SHA-1: 67113c76819195257ab33cadd8f1425e38127e30 SHA-256: caf7bcdc2869c976604b9d23d08990af2c985d6541b8d5e3da49d2b967fe1313
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains a link farm and a redirector link disguised as a "Python tutorial for beginners pdf 2020". The primary malicious URL is https://ttraff.ru/pify?keyword=python+tutorial+for+beginners+pdf+2020, which likely leads to a malicious payload. The document's structure and embedded links suggest a social engineering attempt to trick users into visiting the malicious URL.

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=python+tutorial+for+beginners+pdf+2020
    • http://files.donandmargieabroard.com/uploads/1/3/1/0/131071076/f2b818fc74ed0.pdf
    • http://wefav.nwbcknoxville.com/uploads/1/3/1/4/131483492/gamoxizabukewe_guruv_gilog.pdf
    • http://waxafar.garwoods.com/uploads/1/3/2/7/132741593/3593941.pdf
    • http://jazarabif.ccioh.com/uploads/1/3/2/7/132712615/3466379.pdf
    • https://cdn.shopify.com/s/files/1/0433/1392/2206/files/76148450174.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/25030302187.pdf
    • https://cdn.shopify.com/s/files/1/0431/7691/9200/files/basic_vehicle_maintenance_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0434/8782/1981/files/linebibopenirinem.pdf
    • https://cdn.shopify.com/s/files/1/0429/2860/3295/files/78191929659.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/30857903628.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0711/files/28539420427.pdf
    • https://cdn.shopify.com/s/files/1/0431/9589/1871/files/fofutidenojiwanuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/5541/5445/files/50801590464.pdf
    • https://cdn.shopify.com/s/files/1/0430/2022/2627/files/dupapisaripureta.pdf
    • https://cdn.shopify.com/s/files/1/0429/2752/1948/files/tenunimepipewuta.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/dakadepobu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000099cb.bin
ef79dd504b26e39d40d40d2ae5d121fd17f1203048ab2ee4fe9fb77f4cfd7e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99CB 5704 bytes
font_01_sfnt_off0000ad28.bin
82565b730a90edba3435a10bd9e6b079d455d5a11a40cb733394dce9c9e5ae49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD28 10352 bytes
font_02_sfnt_off0000d089.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 4324 bytes

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