Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaff84d70f0414a5…

MALICIOUS

PDF

57.2 KB Created: 2020-08-18 16:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6cf420da722b52859904ebde5705483 SHA-1: 1290fe7066ee9813fa4c046ca0441cb90b3c9e43 SHA-256: eaff84d70f0414a5b01ea8dac0c9994efcedc1139f90f1f180596829457685d5
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=clsi+esbl+guidelines'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on shopify.com. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and other embedded URLs, suggesting a lure to external malicious content.

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.com/pify?keyword=clsi+esbl+guidelines
    • http://busifo.basilicasm-loretto.org/uploads/1/3/0/7/130776023/zidefugi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5168/7837/files/depibisesujam.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/demesudixagivok.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7629/files/10195411080.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53059057271.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0029/files/kyocera_flip_phone_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5174/files/25045592533.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0417/files/suzepumosijexiromatekuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6647/files/87474118700.pdf
    • https://cdn.shopify.com/s/files/1/0429/5353/9747/files/26839795348.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4631/files/daxop.pdf
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/gegijaxuxuxejoveroni.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_off00008634.bin
22bfd80c55c0389c75859a909022f0d3c7cc10bd79cfbd466e2e8f25ac79900d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8634 4732 bytes
font_01_sfnt_off0000965a.bin
723e9080fecd1e2c27d3cafae8704ced60c7b1e663a64bf42260ded9e4c462bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x965A 14288 bytes
font_02_sfnt_off0000c37e.bin
ebaa9d42c58e3fd25c8264bcf4ef2319fee467c92cf53dcc1f377a20fc8d39b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC37E 16148 bytes