Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92c0d4381658e86…

MALICIOUS

PDF

57.5 KB Created: 2020-08-17 06:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04b782ccfe8f5db23442fd39b7127c8d SHA-1: db12ba550f6f2e9ab918fc9ede82974d38d82dd6 SHA-256: e92c0d4381658e869efe579965c6de755eb4402afe8e9fdec48550f7d884d816
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as 'math worksheets fractions in simplest form'. This link points to 'ttraff.com', which is known malicious infrastructure. The document also contains a large number of external PDF links, many hosted on Shopify, likely for SEO manipulation to increase visibility. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/pify?keyword=math+worksheets+fractions+in+simplest+form
    • http://files.laganhistory.com/uploads/1/3/1/8/131871740/8041193.pdf
    • http://lagej.margesonsclass.com/uploads/1/3/1/4/131437605/1203984.pdf
    • https://cdn.shopify.com/s/files/1/0444/5346/2183/files/ieee_citation_generator.pdf
    • https://cdn.shopify.com/s/files/1/0434/0993/2440/files/crosley_record_player_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9207/files/disafujukilezur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48177964882.pdf
    • https://cdn.shopify.com/s/files/1/0434/1265/2194/files/paradise_lost_book_1_poem.pdf
    • https://cdn.shopify.com/s/files/1/0429/1215/3766/files/binghamton_campus_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/1793/5770/files/90680026070.pdf
    • https://cdn.shopify.com/s/files/1/0435/2176/9627/files/x86_registers_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/73893462681.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/xifunexufizapo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5118/files/84813637511.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_off0000940b.bin
7c31995ff63b2a4738de1290294242e103d923c00e10ea374173c34bdd4c60aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x940B 5204 bytes
font_01_sfnt_off0000a5a4.bin
5fb07effb66ac5edf658eb26cb06e6beb4419decc16adb96cffceca3afd73b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5A4 10928 bytes
font_02_sfnt_off0000cae8.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE8 4324 bytes

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