Malicious PDF — malware analysis report

Static analysis result for SHA-256 8809c765ec375ea6…

MALICIOUS

PDF

50.9 KB Created: 2020-08-24 06:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3cef585b8806ff6990a486401627f79 SHA-1: ca94e22e46cf9cedcd9152e072c5fb0a810f20ee SHA-256: 8809c765ec375ea6ca8e212ed6ba84c4ef97f926fb95b83384adcc4cf6dbf772
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to shopify domains, but one critical link redirects to a known malicious URL. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious redirection. The primary malicious IOC is the redirector URL.

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=game+billiard+online+android
    • http://files.broadcastcoffeeroasters.com/uploads/1/3/0/9/130969448/bubibize.pdf
    • http://files.tlcvegan.com/uploads/1/3/0/7/130776486/7313623.pdf
    • http://files.nalinikrishnankutty.com/uploads/1/3/0/8/130874128/mewajuluxojuvafox.pdf
    • http://kudeziv.oewolfparents.com/uploads/1/3/0/7/130738720/4920a50f34c6.pdf
    • http://vedesaxen.vinified.co.uk/uploads/1/3/2/7/132712615/d7ded195c47fb.pdf
    • https://cdn.shopify.com/s/files/1/0429/3017/6159/files/temperament_test_dog.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/37245900390.pdf
    • https://cdn.shopify.com/s/files/1/0430/6337/8081/files/old_bottle_identification.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5545/files/rewedugozupokefa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/xakuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/boolean_logic.pdf
    • https://cdn.shopify.com/s/files/1/0433/9610/4348/files/nojusujoraxojowip.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/upsc_cds_ii_2018_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0438/8120/1819/files/42950593180.pdf
    • https://cdn.shopify.com/s/files/1/0433/2837/2886/files/rinakabud.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_off000074fd.bin
131598a9247125dcf8f31cecb300e66f9f10a515699de9f8d9da3f131da726e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x74FD 4964 bytes
font_01_sfnt_off000085cd.bin
5bc86e475519be2f7f9fd4acd969f6417c9fcb95fec506942fd5fdff2c916d0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x85CD 10000 bytes
font_02_sfnt_off0000a841.bin
cfcd05a0c4c29650fb289d3b9d3ed26e082e8f5a1b5b712b0509a6c70894056a
pdf-font-stream PDF embedded font (sfnt) at offset 0xA841 16468 bytes