Malicious PDF — malware analysis report

Static analysis result for SHA-256 213dbe21f99130d3…

MALICIOUS

PDF

33.3 KB Created: 2020-08-06 05:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e1d415100e04735dfd253f2de66f9d1 SHA-1: c6d482fad047cda4aa9c08c6a606cc42727c77e6 SHA-256: 213dbe21f99130d3e3a435c7f613d1d1a3f453f95c69c598c9dcc0814937c129
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to benign Shopify URLs, but one critical link redirects to known malicious infrastructure at ttraff.ru. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The document body, though heavily obfuscated, contains the malicious URL, indicating an attempt to trick users into downloading further payloads.

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=physiology+book+ak+jain+pdf+download
    • http://files.spiritualistfellowshipchurchofne.com/uploads/1/3/0/8/130813851/8028542.pdf
    • http://files.joeteacher.org/uploads/1/3/0/7/130776120/050a628c70e.pdf
    • http://files.schec.net/uploads/1/3/1/8/131871894/6851944.pdf
    • http://files.unponteperannefrank.org/uploads/1/3/1/4/131453421/lizokiji.pdf
    • http://files.greatermidwestpb.org/uploads/1/3/2/6/132681316/1737195.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/transnet_bursary_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/7189/6736/files/chemistry_notes_for_class_11_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/setavewu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52325197595.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/67246044112.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4871/files/41801363170.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/2594766568.pdf
    • https://cdn.shopify.com/s/files/1/0438/3706/3328/files/refowivamawimexomuvusir.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6349/files/hockenbury_psychology_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4978/files/nojido.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_off0000438e.bin
f237aa03a42c93ee6be5b8d68bef0b09ab21f06a849627104624940284c62b02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x438E 5680 bytes
font_01_sfnt_off000056fe.bin
0814b9ed2b3a2a6faba5a3ce3194fc2791faa69efff6b0506aad8145f6142261		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56FE 9776 bytes

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