Malicious PDF — malware analysis report

Static analysis result for SHA-256 8013adcb6ecd6e36…

MALICIOUS

PDF

49.4 KB Created: 2020-08-04 21:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f35f3b00b2b89588508a538592f35ea SHA-1: e501bbcf51f14eb64e7fd869d2f0ac917b03c513 SHA-256: 8013adcb6ecd6e3632b1c53d9ce1f4e09ed04b99dd56f5464b0baf1ccc5b131c
128 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=crack+ielts+in+a+flash+letter+writing+pdf'. The document body, though heavily obfuscated, contains text related to IELTS preparation and includes this same URL, suggesting a lure to a malicious site. The presence of a large number of external PDF links further indicates a link farm or redirection strategy.

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=crack+ielts+in+a+flash+letter+writing+pdf
    • http://files.gummystudios.com/uploads/1/3/1/1/131164552/deguvufiwijek-tozeverid-texuvazojogib.pdf
    • http://files.havenofrestbristol.org/uploads/1/3/0/7/130740323/bijadibevulobej-jizuzopesiruso-dirakis.pdf
    • http://files.jeffersonhumane.org/uploads/1/3/1/0/131070820/bunajexer.pdf
    • http://files.kevinchant.com/uploads/1/3/0/8/130873893/9960102.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6568/files/99922944082.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/jusexapujejut.pdf
    • https://cdn.shopify.com/s/files/1/0428/4363/5879/files/88411030285.pdf
    • https://cdn.shopify.com/s/files/1/0429/1336/6182/files/susaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2545/7575/files/3530222335.pdf
    • https://cdn.shopify.com/s/files/1/0430/5197/4818/files/history_of_anthropological_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/3668/0102/files/bowijebiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/d_d_5e_warlock_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/linirowugukoros.pdf
    • https://cdn.shopify.com/s/files/1/0431/5034/4352/files/84424955434.pdf
    • https://cdn.shopify.com/s/files/1/0432/5061/4429/files/73148089009.pdf
    • https://cdn.shopify.com/s/files/1/0432/8688/8612/files/2713047766.pdf
    • https://cdn.shopify.com/s/files/1/0430/8015/5289/files/pibexigug.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_off00006c92.bin
dc762b7d464748b1566c80d0338901519e425552e893e9f870759ff55328bc32
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C92 5476 bytes
font_01_sfnt_off00007f41.bin
80c6d2e9ff8d4c6a8190aa4ffd57d60b544fcad84b98e91ab7f091c202f67fa6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F41 9724 bytes
font_02_sfnt_off0000a091.bin
37bd0a1fd69eb6953a9e8f9b9df4537d182badedf1c3cb64c3bb0344c35ccdaa
pdf-font-stream PDF embedded font (sfnt) at offset 0xA091 16836 bytes