Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e840be7b7d1a258…

MALICIOUS

PDF

42.1 KB Created: 2020-08-11 01:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9683dca68e7d0fd0647e59bbac1feca0 SHA-1: c1f381f4b53db3f7a1043f0ae4db7595b2aba925 SHA-256: 3e840be7b7d1a25842c3f79684fa4a41432d713ea3940685b84cc1112d4cf275
120 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.ru, which is presented to the user as a 'common core state standards pdf'. This indicates a phishing or social engineering attempt to direct the user to malicious infrastructure. The file also contains a large number of links to external PDFs hosted on Shopify, suggesting a link farm or SEO poisoning tactic. No scripts were extracted, and the document body is heavily obfuscated.

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.ru/pify?keyword=common+core+state+standards+pdf
    • http://files.heat-shield.info/uploads/1/3/0/7/130738841/3312676.pdf
    • http://files.coachhousecochins.com/uploads/1/3/1/0/131069764/1825010.pdf
    • http://files.caseyscurbside.com/uploads/1/3/0/9/130969656/kotow_vebowul_pifojuruvefile_valeme.pdf
    • http://files.northernjigs.ca/uploads/1/3/1/4/131438667/wujusonen.pdf
    • https://cdn.shopify.com/s/files/1/0428/1306/3327/files/40414823892.pdf
    • https://cdn.shopify.com/s/files/1/0435/3314/0127/files/zeweretufifijogewamo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/auto_repair_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0245/files/76707810827.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/guludo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/33321508906.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/diffraction_grating_spectrometer_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0437/0094/5048/files/absolute_rc_plane_sim.pdf
    • https://cdn.shopify.com/s/files/1/0436/5441/4494/files/jail_brake_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0432/7669/7760/files/tutorial_after_effects_cc_2020_espaol.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/1/0436/5441/4494/files/jail_bra

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006828.bin
c79e825a6b2d9d0b2f6218cf620e8083562a00e15a7eefa62c0b421c7a4585b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6828 5172 bytes
font_01_sfnt_off0000799c.bin
9db7679dd7554f9d3fbb1358765ec4c0f3dd96fd98495f2bb4e54e2ba80db103		 pdf-font-stream PDF embedded font (sfnt) at offset 0x799C 10104 bytes

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