Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90817794babd8b2…

MALICIOUS

PDF

39.8 KB Created: 2020-09-10 14:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d89269b4cf8198fe1eb4fba85e1d612 SHA-1: a778da98df9c99f8b62e428d3cbf7d00bc7a5388 SHA-256: e90817794babd8b2c468733618bb4ed4d2375849a540e2c1ca02859cf978a983
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the primary malicious URL. Additionally, the PDF hosts a large number of external links, many pointing to Shopify, suggesting a link farm tactic to obscure the malicious destination.

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.club/wix?keyword=the+kooples+size+guide+dress
    • https://cdn.shopify.com/s/files/1/0437/8948/4190/files/sulubulamivowoluwowufeja.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/new_assamese_song_2018_kussum_koilash.pdf
    • https://cdn.shopify.com/s/files/1/0437/1621/4939/files/greek_mythology_stories_tagalog.pdf
    • https://cdn.shopify.com/s/files/1/0428/0755/8310/files/vafedesasuseta.pdf
    • https://cdn.shopify.com/s/files/1/0439/7416/4638/files/antonyms_and_synonyms_activity_sheets.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_1fe4cf728412462c864e434a23e93d2d.pdf
    • https://static.usrfiles.com/ugd/f64db8_480810ee8fe64a5da8498c04685af489.pdf
    • https://static.usrfiles.com/ugd/b371d9_03587ac02cfa4346b779470af697384c.pdf
    • https://static.usrfiles.com/ugd/41f880_8676733e8ce44e3b884e6dd4e35300ba.pdf
    • https://cdn.shopify.com/s/files/1/0432/6244/3683/files/ketone_body_formation_regulation.pdf
    • https://cdn.shopify.com/s/files/1/0428/2171/4079/files/23934680117.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/newizasa.pdf
    • https://cdn.shopify.com/s/files/1/0428/1348/9319/files/abb_voltage_transformer.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3609/files/luxogofabupatomaluz.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_off00005db6.bin
5e4b4561542ba771fa4a904311a7bde4917815d4c78fbe96b70982b954983947
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB6 5072 bytes
font_01_sfnt_off00006efb.bin
1caf7604a3d5b8c688ba7da5bb53d1e7170c6dead09585d273ada92274c12a0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFB 10420 bytes