Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c84e68c2a6ab08…

MALICIOUS

PDF

37.5 KB Created: 2020-08-27 15:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 616157d8f1002fc810188a44c61a54c6 SHA-1: 13a9e70bc195fd6588f374571d9c0b1b0b9f3ba8 SHA-256: 25c84e68c2a6ab083081b87afd244296ffa9035ac2c2d1b4891557877934ee0a
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a link farm or SEO poisoning tactic to disguise malicious URLs. The document body, though heavily obfuscated, contains the same malicious URL and benign-looking academic titles, reinforcing the lure. No scripts were extracted from this sample.

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=trail+guide+to+the+body+student+workbook+5th+edition+ebook
    • http://files.tcmattsandsons.com/uploads/1/3/1/3/131384492/monixanibel-jenexurewujep-ninonawuj.pdf
    • http://files.biancaking.ch/uploads/1/3/0/8/130874205/jusifawi-bomiwasufiv-rirarafak-wurogomav.pdf
    • http://files.harringtonlanefarmsvillageshop.com/uploads/1/3/1/4/131454770/5153019.pdf
    • http://navew.taiwanhotelnews.com/uploads/1/3/0/8/130813714/pumenixuwifo.pdf
    • http://files.petebouchard.com/uploads/1/3/1/3/131378918/gutotaseno-lujisin-furumuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/tefugadikebobutivibofiwo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8447/9641/files/janufoxajuwedukikix.pdf
    • https://cdn.shopify.com/s/files/1/0433/5344/0414/files/ludujuvilupuwokewuvimig.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/enfoque_biopsicosocial.pdf
    • https://cdn.shopify.com/s/files/1/0431/8068/7524/files/wezigilajapekuxupaxireb.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/merge_files_with_adobe_acrobat_reader.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/jejilifugugobe.pdf
    • https://cdn.shopify.com/s/files/1/0437/9171/2405/files/anti_ragging_act_2020.pdf
    • https://cdn.shopify.com/s/files/1/0438/0160/8353/files/nabutomoxowujanowewizele.pdf
    • https://cdn.shopify.com/s/files/1/0432/5320/3102/files/90978007722.pdf
    • https://cdn.shopify.com/s/files/1/0435/6908/6623/files/balanceo_por_redox_ejercicios_resueltos.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_off0000481d.bin
ebca07db678d0662a0d628f52f951e106ec23938b4799013fcdc756072e34680
pdf-font-stream PDF embedded font (sfnt) at offset 0x481D 5440 bytes
font_01_sfnt_off00005a9f.bin
2c5e2724483a0cfddf523d160358a175a340efec510334629888dc828422a0d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9F 9344 bytes
font_02_sfnt_off00007a83.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A83 4324 bytes