Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9a1aa281f33ed8…

MALICIOUS

PDF

57.8 KB Created: 2020-08-30 09:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39258e7c745f25eaabc5c0bd305db90a SHA-1: 42eecf345b7809b17b1ce45bcb183753ab8dcad7 SHA-256: cc9a1aa281f33ed800725d3ae3c70378a32e4a17b826ab72d482f1b6c6b37519
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL that is flagged as malicious, disguised as a search result for a specific book. The document also contains a large number of embedded links, many pointing to static.usrfiles.com, which is identified as a link farm. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the presence of the malicious redirector and the link farm structure suggests a phishing or malware distribution attempt.

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.ru/wix?keyword=molecular+biology+of+the+cell+alberts+b
    • https://static.usrfiles.com/ugd/b8c837_b49899ea6ce24531be5abbcbe765ce65.pdf
    • https://static.usrfiles.com/ugd/a48928_94c98b502a3347b3acc9c2ce3df94805.pdf
    • https://static.usrfiles.com/ugd/07ef24_b75f6f47af7e477d986faff72c473a10.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ad85f5ae8da4d7c99c617cbe6626cb2.pdf
    • https://static.usrfiles.com/ugd/b8c837_794924bd2501441fa6219088ae1e30bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dab864b09424ea39e6afd3326ba8111.pdf
    • https://static.usrfiles.com/ugd/0c268c_f1b0c58ffdcc4a7da4b8685fd8baafe2.pdf
    • https://cdn.shopify.com/s/files/1/0430/0315/0499/files/74524980263.pdf
    • https://cdn.shopify.com/s/files/1/0434/1553/5774/files/gipamo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/wososizajupatunafemibiki.pdf
    • https://cdn.shopify.com/s/files/1/0434/2874/1285/files/case_files_neurology_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/4704/9621/files/pathophysiology_of_peptic_ulcer.pdf
    • https://cdn.shopify.com/s/files/1/0431/4012/0733/files/aprendizajes_clave_sexto_grado_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0428/8780/7129/files/zajegetevonilirowego.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_off00008e2a.bin
6f6af1f6d3284752238879844d20bd05a1782165f9c74e4eef350861dbc94a75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2A 5392 bytes
font_01_sfnt_off0000a090.bin
eb32a69db166e8484b06593424c58f93df684b46b022b2f6432f1a9fe79ecbe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA090 10404 bytes
font_02_sfnt_off0000c476.bin
aabbb95e4258a1bccfe6759090a0a8b97a33e8154131110566ffb2eaa8fdb080		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC476 16148 bytes

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