Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd64c5a9c426f490…

MALICIOUS

PDF

60.3 KB Created: 2020-08-06 19:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2a2cec3715627e51612a6e1b277a364 SHA-1: 9c04e4df05c6881202f672c056cf6884c703c4d3 SHA-256: cd64c5a9c426f490702ab2accafef468ec309c2cfd179951c507fc16fd9bb99c
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=kampala+international+university+fees+structure+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary intent is to trick the user into visiting this 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.ru/pify?keyword=kampala+international+university+fees+structure+pdf
    • http://files.sarahrorvig.com/uploads/1/3/1/6/131606465/d065f105e1cf174.pdf
    • http://files.bgphotographic.co.uk/uploads/1/3/1/3/131380754/fecaac9d54.pdf
    • http://files.monkeysbnb.com/uploads/1/3/1/0/131071295/pigekib.pdf
    • https://cdn.shopify.com/s/files/1/0435/2661/9288/files/java_default_value.pdf
    • https://cdn.shopify.com/s/files/1/0447/9755/8941/files/cause_and_effect_essay_topics.pdf
    • https://cdn.shopify.com/s/files/1/0434/6501/5446/files/95734270840.pdf
    • https://cdn.shopify.com/s/files/1/0431/0568/1557/files/36118217123.pdf
    • https://cdn.shopify.com/s/files/1/0430/6095/3249/files/5918913679.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7750/files/faselukedep.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/31357575123.pdf
    • https://cdn.shopify.com/s/files/1/0434/4994/2176/files/28564472799.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/75766787101.pdf
    • https://cdn.shopify.com/s/files/1/0429/0543/6326/files/70453651822.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/viborovikumowenaben.pdf
    • https://cdn.shopify.com/s/files/1/0428/4026/0775/files/64274644274.pdf
    • https://cdn.shopify.com/s/files/1/0430/7592/8215/files/59727811892.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009fbc.bin
0bcbe064e8c60ba2b4b4c4362867422ecbed2fe776e2620512a71e02fe682b3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FBC 5432 bytes
font_01_sfnt_off0000b232.bin
bc783b6a1949dc03b461949b8a7f22e258e292b3e2a8552f0d0b26a2ec8f9182
pdf-font-stream PDF embedded font (sfnt) at offset 0xB232 16320 bytes