Malicious PDF — malware analysis report

Static analysis result for SHA-256 820ec37f0dfeef51…

MALICIOUS

PDF

41.3 KB Created: 2020-08-31 01:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 133f959bba15a59f422da3de55a20824 SHA-1: dc87d869e799351ccf543242ce4259cc237ac269 SHA-256: 820ec37f0dfeef511ce33925df8e0cfd3f734726f1cdcd097b9d37a93ff906eb
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Forex trading tutorial pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of multiple Shopify and static.usrfiles.com links indicates a link farm strategy, likely to improve SEO for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=forex+trading+tutorial+pdf
    • https://cdn.shopify.com/s/files/1/0431/6243/5739/files/acca_manual_s.pdf
    • https://cdn.shopify.com/s/files/1/0454/8503/1576/files/tense_helping_verb_chart.pdf
    • https://cdn.shopify.com/s/files/1/0436/0133/0339/files/baccharis_dracunculifolia.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4105/files/mysql_safe_update_mode.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/88221649004.pdf
    • https://cdn.shopify.com/s/files/1/0434/7694/3000/files/chemistry_for_engineering_students.pdf
    • https://static.usrfiles.com/ugd/374ce0_aef7ed01a0c04fa49bc8337c1a263ce4.pdf
    • https://static.usrfiles.com/ugd/e23fbb_239b95d1faee477fa94cfe3326038164.pdf
    • https://static.usrfiles.com/ugd/77941b_741986ce531b43b5ad80933673c93f0f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4aa6b52ad8c4f63ba4bd253b9a4b068.pdf
    • https://static.usrfiles.com/ugd/b8c837_92f61fd7709348829d26cdb77bbda20c.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc8c2cb50eb44ad7bc8a04a14cb559bd.pdf
    • https://static.usrfiles.com/ugd/a01749_9b4c96d964124cf6ad546338bd77c797.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_off0000645d.bin
76c5a14d2f2e42f83da5c66f61b2f20270582c5f15e85d6d78370985bb83deb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x645D 5056 bytes
font_01_sfnt_off000075a8.bin
64fd5a2914b7c207301185913449600acf7d6a57b4985e6f39719c6795f839c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x75A8 10308 bytes