Malicious PDF — malware analysis report

Static analysis result for SHA-256 76aaa07bab631b5d…

MALICIOUS

PDF

61.1 KB Created: 2020-08-30 01:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 161d3e3578a712a45c8c75c0f6629d43 SHA-1: 1197e14b58bef86191d3ac8f5b19c1802e4d4030 SHA-256: 76aaa07bab631b5d5e0bfb17893667485669082f1f69353c249726e980aff1fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one critical heuristic identifying it as a malicious redirector. The primary malicious URL, 'https://ttraff.cc/wix?keyword=cracking+the+advertising+code+worksheet+answers', is embedded within the document body, suggesting an attempt to lure the user to a potentially harmful site. The presence of many external PDF links further indicates a link farm or SEO manipulation tactic, likely to obscure the malicious intent.

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.cc/wix?keyword=cracking+the+advertising+code+worksheet+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/cc14e4_aa879b1dfdb64d8eaed196a08ee3766c.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa32e7286ed54b8caacc51df05390803.pdf
    • https://static.usrfiles.com/ugd/61b8bf_105b31cc87094cd5bc79bd2cb3702b0b.pdf
    • https://static.usrfiles.com/ugd/b8c837_28659cd01f1f4b75b434e49e3ee1b8be.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/zobori.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/3214858294.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0663/files/88141671751.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1346/files/43731149625.pdf
    • https://static.usrfiles.com/ugd/4b7290_e2d13b5a529c467fa9169e812c80ef80.pdf
    • https://static.usrfiles.com/ugd/0aab01_3b7e98cd1bd94714aacba80cb00d3718.pdf
    • https://static.usrfiles.com/ugd/b8c837_b773e220c0374784937e1a949d98038a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fb9aedc51804b0da9bd5ac73ec33ef4.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef2bd8778cf849fd9c7f220d72f0503f.pdf
    • https://cdn.shopify.com/s/files/1/0440/8426/5110/files/range_rover_sport_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53567737566.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tevegijetowid.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b158.bin
035768826b531e6177116dae2114bbacad82e48c392667284e6a6b23c87d767b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB158 5288 bytes
font_01_sfnt_off0000c361.bin
eb34341b1a5b37a68efd85792a4683c23988a8e355935eed1e282e9a5c9bc524		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC361 10696 bytes

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