Malicious PDF — malware analysis report

Static analysis result for SHA-256 900dd28c050c48ce…

MALICIOUS

PDF

42.9 KB Created: 2020-08-15 14:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65291b6b5547501b225d998a19fe5e14 SHA-1: dfb084ba41b7efceb72c25108201005ce628e92e SHA-256: 900dd28c050c48ce6f4c2fce3b78f164c6515bc3ce8469515d3503d9cb2f390c
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to benign Shopify domains but one critical link to a known malicious redirector at `ttraff.cc`. The document body, though heavily corrupted, contains the text 'Resistor color code practice worksheet with answers' and the malicious URL, suggesting a lure to trick users into clicking the link. No scripts were extracted, but the presence of the malicious redirector and the link farm indicates a likely phishing or malware distribution attempt.

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.cc/wb?keyword=resistor%20color%20code%20practice%20worksheet%20with%20answers
    • http://files.shiuanchang.com/uploads/1/3/1/4/131406337/wetadejomotelen.pdf
    • http://lugapi.doubletroubletraining.com/uploads/1/3/0/8/130874493/5806707.pdf
    • http://files.acdclothing2014.com/uploads/1/3/0/8/130814055/52794dd3771f0c3.pdf
    • http://rulifubuk.toothfairysoftware.com/uploads/1/3/0/8/130813364/xesixe.pdf
    • http://files.rbvonline.com/uploads/1/3/0/8/130873738/levarok-fezalepaka-zipoluzuririred-wabib.pdf
    • https://cdn.shopify.com/s/files/1/0432/0326/4667/files/split_merge_files_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/mapupomejunaligabiveba.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/balancing_redox_reactions_in_acidic_solution_practice_problems.pdf
    • https://cdn.shopify.com/s/files/1/0428/6382/0959/files/49225302138.pdf
    • https://cdn.shopify.com/s/files/1/0428/6545/9366/files/86420364180.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/lowezegaku.pdf
    • https://cdn.shopify.com/s/files/1/0432/8397/2256/files/78452364262.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/bazupiparosa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/18181292178.pdf
    • https://cdn.shopify.com/s/files/1/0433/6638/3768/files/auditorium_floor_plan.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_off00005be9.bin
9e1ce6048dc5c76967cd02941730cd928bfa9c54109f234a2f0d32b4a035e092
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE9 5112 bytes
font_01_sfnt_off00006d4d.bin
0579ece490a46ee822d4353d925900581a57529b350ac99d435dab3ac98af5ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D4D 10176 bytes
font_02_sfnt_off00009011.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x9011 4324 bytes