Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17b7f5cc7f3d0bd…

MALICIOUS

PDF

52.4 KB Created: 2020-08-14 01:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4ecb9034687aa4f4864070632dfdd69 SHA-1: ab45d22d2227624ae90de397195afad340342583 SHA-256: d17b7f5cc7f3d0bdaefa2effed15fa2ee45c1f9d1e24660838bfc92f00da610c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains a lure for an 'Algebra 2 review packet answer key' which, upon inspection, links to a known malicious redirector. The document also contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The presence of a callback phishing lure further supports a social engineering attack vector. No scripts were extracted from this sample.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns
  • 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=algebra+2+review+packet+answer+key
    • http://tirem.rlesmedia.com/uploads/1/3/1/3/131383839/525dde7c6e8.pdf
    • http://kugaxamin.cleansteamusa.org/uploads/1/3/2/6/132695476/wakazerina_rixixepebapek.pdf
    • http://files.stfrancisdesales-saginaw.org/uploads/1/3/0/8/130874278/5742218.pdf
    • http://nagiromem.hadialqazwini.com/uploads/1/3/0/7/130740596/mepij-viduzovudov-koxaj.pdf
    • http://files.vasiliapiritidou.com/uploads/1/3/0/7/130776724/jarumidemo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7990/9030/files/44964766192.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6845/files/candida_diet.pdf
    • https://cdn.shopify.com/s/files/1/0435/8694/5187/files/17914045614.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4261/files/suveviboloz.pdf
    • https://cdn.shopify.com/s/files/1/0429/1805/1996/files/dark_souls_2_soul_spear.pdf
    • https://cdn.shopify.com/s/files/1/0428/9721/1551/files/88531051388.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0171/files/9324696246.pdf
    • https://cdn.shopify.com/s/files/1/0428/4874/7676/files/92992556782.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7961/files/45848826752.pdf
    • https://cdn.shopify.com/s/files/1/0439/9484/1246/files/audiometria_tonal_liminar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/gummy_bear_science_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/syllabus_design_and_curriculum_development.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_off00007305.bin
c9bfb09f775f962df23fc16a1fd16a748898f3caa9880caf9c9c2cd58cad6414
pdf-font-stream PDF embedded font (sfnt) at offset 0x7305 5680 bytes
font_01_sfnt_off00008689.bin
2693e534cfa2ed9ea0f6be2f6a89e78d177503b9a9c30891d4cf687683433b56
pdf-font-stream PDF embedded font (sfnt) at offset 0x8689 11004 bytes
font_02_sfnt_off0000ac4f.bin
50868bcaaa34c576978ec5e9a9889b5ed8e42db74f06ebb72694371d030a44e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4F 16780 bytes