Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64015bef6238595…

MALICIOUS

PDF

55.3 KB Created: 2020-08-18 23:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4cb648654ba03205ad93e1c91021a88 SHA-1: 1ba0cf27a5733997dc13a6d3565fc1ad93f303a5 SHA-256: d64015bef6238595e2ced3b9fcbd0daf560a43e28cd1c21588284f258eb1ea19
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to distribute malicious content or phishing lures through numerous seemingly benign PDF documents hosted on platforms like Shopify, with the primary redirector being traff.cc.

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.cc/pify?keyword=bootstrap+3+basic+template
    • http://sodigola.riverlandsredbarn.com/uploads/1/3/0/8/130814297/saduk_daxojironaz_vaxazikikonuka_turini.pdf
    • https://cdn.shopify.com/s/files/1/0445/8476/3556/files/que_significa_languidece_segun_la_biblia.pdf
    • https://cdn.shopify.com/s/files/1/0428/5834/8703/files/bitikiwax.pdf
    • https://cdn.shopify.com/s/files/1/0436/0008/5149/files/scope_of_variables_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0439/9369/4366/files/soil_amendments.pdf
    • https://cdn.shopify.com/s/files/1/0429/3961/3347/files/79329016873.pdf
    • https://cdn.shopify.com/s/files/1/0438/2697/0786/files/jelly_bean_worksheets_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/wesegepabufegujib.pdf
    • https://cdn.shopify.com/s/files/1/0434/2562/8327/files/2314033391.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/46789756157.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4189/files/zevab.pdf
    • https://cdn.shopify.com/s/files/1/0438/0937/4365/files/60073498985.pdf
    • https://cdn.shopify.com/s/files/1/0435/6869/3411/files/capital_budgeting_book.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_off00008d32.bin
f9116a4a7f4925df259c0a9e7d43b8db442bf7a6c02f2e25fce1b7dd554c6c6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D32 5432 bytes
font_01_sfnt_off00009f8b.bin
26d3ba3d562ea22f5bbdf2119a7f969642a7d1d9bffaba047aaccfc5968467bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F8B 15468 bytes