Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb8813ee1d76fc5…

MALICIOUS

PDF

52.4 KB Created: 2020-08-30 09:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc5bb617d070ae2da6d90670b57a5274 SHA-1: 3eca981d6773663c365af6f74065a7a0127e8f47 SHA-256: abb8813ee1d76fc592060df3c6680cc0ebf4b7dc41015a0abbbeae2170ac1803
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, disguised with a seemingly innocuous keyword. The PDF also hosts a large number of external links, many pointing to Shopify domains, suggesting a link farm for SEO poisoning or traffic redirection. No scripts were extracted, but the presence of a malicious redirector and the link farm indicate 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=datos+curiosos+de+ecuaciones+cuadrat
    • https://static.usrfiles.com/ugd/b0b521_0a7ee6e191044d48b316d8e7196d08c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a6e6c3af0e04fbc8a3a456fb6f199ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_425172f5ef1142d281c972b79a3e1579.pdf
    • https://static.usrfiles.com/ugd/fe83c3_ee09f35c0c644338a052b8a3590ffb75.pdf
    • https://static.usrfiles.com/ugd/b58d21_985bea53765c415b8de66ec65f7a83c8.pdf
    • https://cdn.shopify.com/s/files/1/0437/5163/7141/files/kebupofolug.pdf
    • https://cdn.shopify.com/s/files/1/0429/3961/3347/files/66279852402.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wakudegebemufajetexu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/25476853319.pdf
    • https://cdn.shopify.com/s/files/1/0463/1517/6096/files/ficha_tecnica_de_raven_escala_general.pdf
    • https://cdn.shopify.com/s/files/1/0449/4937/3087/files/akuntansi_pemerintahan_deddi_nordiawan.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6156/files/ritaralafonopoxedujitid.pdf
    • https://cdn.shopify.com/s/files/1/0457/6618/1020/files/eerie_elementary_the_school_is_alive_worksheets.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_off00007e5c.bin
2ebf6ade74fa9e5d96a3ca1c10e08ef19daff4126331072e581760af528d7e1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5C 4784 bytes
font_01_sfnt_off00008e9f.bin
693854d8795f8c98c25021d0d701c0114229ddfd725d5bca1b11e6d79c05e014
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9F 11808 bytes
font_02_sfnt_off0000b4f0.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F0 4324 bytes