Malicious PDF — malware analysis report

Static analysis result for SHA-256 983ef610a4437c80…

MALICIOUS

PDF

51.7 KB Created: 2020-08-31 03:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e769c5aa7fda4a092953b43659e39f39 SHA-1: 4bda10a2749d21eda3cd2417712b9c779ef8cb9b SHA-256: 983ef610a4437c80b7dce0b64034533ec0cdb18a66bfb916266cb72602d6eb7e
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link, pointing to 'ttraff.me'. Additionally, another critical heuristic detected a PDF link farm with 30 external links, many hosted on 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same suspicious URL. These findings suggest the PDF is designed to lure users into clicking through a large number of links, likely leading to malicious content or spam.

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.me/wix?keyword=phonetics+and+phonology+by+peter+roa
    • https://static.usrfiles.com/ugd/930050_1b04696ca76a41e48151d750f90ab1bb.pdf
    • https://static.usrfiles.com/ugd/b5aed9_4e6a786bcbb545179baa797ac22954fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_babdc4933463447196e67db98e992f05.pdf
    • https://static.usrfiles.com/ugd/136d07_16c99a039a87416b9443ce18be40e292.pdf
    • https://cdn.shopify.com/s/files/1/0437/8784/5790/files/que_es_un_catalizador_en_biologia.pdf
    • https://cdn.shopify.com/s/files/1/0434/8978/8069/files/xosiwed.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2459/files/apache_poi_maven.pdf
    • https://cdn.shopify.com/s/files/1/0433/1814/9285/files/master_heater_parts.pdf
    • https://static.usrfiles.com/ugd/3bcfef_3b55adb6c01d400aa748c881dc40803d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8405a7a87514521a8b6e3a1fa891439.pdf
    • https://static.usrfiles.com/ugd/04e6f9_2f5f69d9039448e1a208960588dd5841.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8fc5307b7c84764b06b437b970d8ec4.pdf
    • https://static.usrfiles.com/ugd/1d64af_7123143a70664c10bcd842f49a620900.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a5292da23ce48898edcd08b9f4abffa.pdf
    • https://static.usrfiles.com/ugd/8b49c6_9134d941266446ca94e4d8c6e9dacc90.pdf
    • https://static.usrfiles.com/ugd/2f07a1_cd4dcaee8367409abef10e1e0b312ad8.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_off0000709a.bin
a681fcb129107e24ffafad022d375206a622d704bfa9bb3f91a061be680d6633		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709A 5576 bytes
font_01_sfnt_off00008384.bin
5c0a23fc8ca895dfa2564b3f72994c4a0fc568ce12478e9ec05151df2873be4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8384 12856 bytes
font_02_sfnt_off0000ac8a.bin
6fffb1aeb89666cbcaec4ce24454e19e9ad5757041bd2745d7057949fb60916b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8A 16116 bytes

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