Malicious PDF — malware analysis report

Static analysis result for SHA-256 b911c59dd459e7cc…

MALICIOUS

PDF

42.8 KB Created: 2020-08-14 21:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f49d9515f9484848ed820f6694935c5 SHA-1: 333d9678bbe8ea11f8104e4a18aab7fb0b35b0b1 SHA-256: b911c59dd459e7cc0e38c58aa2f9c93ebf5e1affce4129fd39ff9a906b748941
128 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.ru'. The document body also contains the same URL and a lure related to an 'application letter template', indicating a social engineering attempt to drive traffic to malicious sites.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=application+letter+template+docx
    • http://files.wynning-solutions.com/uploads/1/3/2/6/132681307/04d86.pdf
    • http://files.mikelahenrylowe.com/uploads/1/3/1/4/131438059/2426281.pdf
    • http://files.babbiemuseum.org/uploads/1/3/0/8/130814297/6809079.pdf
    • http://kujiw.mdt-agilityability.com/uploads/1/3/1/6/131606349/f89d91956cc1.pdf
    • http://files.professionaldevelopmentservices.com/uploads/1/3/1/8/131856039/nebujiluwes.pdf
    • https://cdn.shopify.com/s/files/1/0434/1714/1415/files/reading_comprehension_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0428/2449/9367/files/tukek.pdf
    • https://cdn.shopify.com/s/files/1/0431/3818/7413/files/obsidian_farm_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0439/1161/0536/files/clinical_laboratory_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/jilisonate.pdf
    • https://cdn.shopify.com/s/files/1/0435/3880/8991/files/70568481493.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/lonuzem.pdf
    • https://cdn.shopify.com/s/files/1/0433/1021/9432/files/1591950191.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/adverb_phrase_examples.pdf
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/perdoname_gerardo_ortiz_lyrics.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_off00006966.bin
bfd95d7990311c183f8b685328027a8d0e109990d83fec7eab6692bf04dd91c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6966 5100 bytes
font_01_sfnt_off00007a9b.bin
9706262f66192b78baf11be952ff443acd0cd7dc28b0812ae6d874c5dcc45f54
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9B 10588 bytes