Malicious PDF — malware analysis report

Static analysis result for SHA-256 94cb898972572af0…

MALICIOUS

PDF

52.1 KB Created: 2020-08-29 18:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da43767c5a4df1485500d33a48e1edb9 SHA-1: 583873195003d6bc14431eff655e754a2146e8ca SHA-256: 94cb898972572af0b7e75ed571bae742a019891cbfef5652dd4ac5917460b7d8
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=john+maxwell+5+levels+of+leadership+pdf'. This URL is the primary indicator of malicious intent. The document body, though heavily corrupted, contains text fragments that appear to be SEO-related keywords and the malicious URL itself, suggesting a lure to disguise the malicious link. The presence of numerous other PDF links, many hosted on static.usrfiles.com, indicates a link farm strategy, likely to improve search engine ranking for the 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.ru/wix?keyword=john+maxwell+5+levels+of+leadership+pdf
    • https://static.usrfiles.com/ugd/b8c837_4bccd6a9c70c48b3ae72f07ad2df43aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_27f9a31da7ce463b889c2bad17b635fc.pdf
    • https://static.usrfiles.com/ugd/b4a829_d8e22e54f5c645c8aead0f26a85917f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_cfdc32b0b66e476689a6d2f217995cc9.pdf
    • https://cdn.shopify.com/s/files/1/0452/4769/2957/files/bareilly_ki_barfi_free_movies_counter.pdf
    • https://cdn.shopify.com/s/files/1/0430/0881/9349/files/89515757122.pdf
    • https://cdn.shopify.com/s/files/1/0435/1059/5748/files/votebefurifilo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/jinoturixigosujevuponolen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9776/8614/files/fifolonemizip.pdf
    • https://static.usrfiles.com/ugd/136d07_b98a5de41d1449929f1216e3b3511133.pdf
    • https://static.usrfiles.com/ugd/80bfa9_6080c5272dd5473eb24d9cc1213272e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5f08c09417a4dd1b0fbff13dde06744.pdf
    • https://static.usrfiles.com/ugd/65b209_13559e1586214221a041b1cd2db58f5a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7561fce18c124605ba7d43927f70ad2c.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_off00008047.bin
a448f652f073744cae028d193b7cb8333c311ec327b08d9f7c4604807032852f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8047 5324 bytes
font_01_sfnt_off0000923d.bin
943ac6b1ab2fa01e64a1f1ef3bc4a3e9d1293feba57995c4ed4612723776ad31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x923D 10300 bytes
font_02_sfnt_off0000b555.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB555 4324 bytes

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