Malicious PDF — malware analysis report

Static analysis result for SHA-256 577312448231e5e9…

MALICIOUS

PDF

51.9 KB Created: 2020-08-31 10:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f065a0c921bbb8b637cc1ae49150261 SHA-1: f27ef0a36cf27a4ecaf8e99a92a7cd535f6a1dc4 SHA-256: 577312448231e5e95fd1859c57211eca5659f8a39bfc23fdd2d90429623d40b3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded document body text, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=libros+estadistica+pdf', which is also flagged as malicious. The presence of a large number of external PDF links, many pointing to benign content, suggests a link farm or SEO poisoning tactic to mask the malicious redirector.

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=libros+estadistica+pdf
    • https://static.usrfiles.com/ugd/9b33c5_b2d065a009c24444b58a001268564336.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_c1ff9a13ae74486b88a48edca2e4c0d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8ec1c93e2124960808ea6b7f82222e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_cec769a20d4b4e14ac8439ac311efde1.pdf
    • https://static.usrfiles.com/ugd/55cc32_80e12ea16bc64a36a8a2ffeacb025f4f.pdf
    • https://cdn.shopify.com/s/files/1/0433/1149/7366/files/96349977032.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xodowowesibaxen.pdf
    • https://cdn.shopify.com/s/files/1/0441/2263/6440/files/beowulf_summary_and_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0436/4340/4441/files/naruto_shippuden_episode_30.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/wosimanitela.pdf
    • https://static.usrfiles.com/ugd/a2e20a_d2c48bbd4b2a47298c6a07788fad225a.pdf
    • https://static.usrfiles.com/ugd/b8c837_381aa3bd863a4c23a4a420bf189cbeb8.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa86e560b5d84967a8f05fbf899b2897.pdf
    • https://static.usrfiles.com/ugd/738632_89bb40df319a414e918786fd88da27b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbe8eabb1a6f49d1b5a695917e28f736.pdf
    • https://static.usrfiles.com/ugd/238140_a367e8b954b04abcbad252b562b668a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e1bfc5ecf2f40c38a8566400a3a9068.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d68b757b6564f6597666d79b09c24aa.pdf
    • https://static.usrfiles.com/ugd/963627_f2bfd239457a4133ba00296b7406567f.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_c34202c44af243ee96e5ac5f5efdade6.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_off0000745d.bin
ed1296db3c6fb6679fa0e03d6af0b71734709cf69852b210ddd4456b20cab4d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x745D 5200 bytes
font_01_sfnt_off00008611.bin
27e8798d118f4f5f578c9fbf1061eb522dd2acb9d2ee017263b057afe6286d6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8611 11332 bytes
font_02_sfnt_off0000ab1b.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB1B 16312 bytes

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