Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0111dc6f2497af…

MALICIOUS

PDF

48.4 KB Created: 2020-07-31 13:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0eb5df1af94ab8c36ee5ee09747efdba SHA-1: e3629d746d25150fa18fe9f79c691c87cc84515c SHA-256: dc0111dc6f2497af96e0f4693c562efa7885c2faa5556a103af3f7b9249d8a5a
152 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one identified as a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, indicating the document's primary purpose is to redirect users to harmful sites. The 'PDF_SEO_LINK_FARM' heuristic further suggests a tactic of overwhelming search engines with links to potentially malicious or low-quality content, disguised as delivery menus. The ML classifier strongly supports the malicious nature of this PDF.

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=amber+delivery+menu+pdf
    • http://files.lilacvillagebb.com/uploads/1/3/1/4/131437531/gamirifusow.pdf
    • http://files.theprideofsouthside.com/uploads/1/3/0/7/130739393/90c92.pdf
    • http://files.eyeandpen.com/uploads/1/3/1/4/131453610/gigakosomaro.pdf
    • http://files.eyean
    • https://cdn.shopify.com/s/files/1/0438/1235/6253/files/98202588794.pdf
    • https://cdn.shopify.com/s/files/1/0428/4956/6886/files/70929098373.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/24047387249.pdf
    • https://cdn.shopify.com/s/files/1/0434/8759/2608/files/fepebaxusunitifozi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/kamogabudiza.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/vizebovosufawelubi.pdf
    • https://cdn.shopify.com/s/files/1/0440/4638/5317/files/fiduseguziju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuxopikuxoxixu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6963/5734/files/55303807740.pdf
    • https://cdn.shopify.com/s/files/1/0430/1262/0447/files/51625543469.pdf
    • https://cdn.shopify.com/s/files/1/0437/4737/7301/files/josanifiwinizivufas.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_off00006abe.bin
ead694aed3cea9b8ec58c9e7224a398f991df26a44c2b282a99c7d276bc92d7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABE 4784 bytes
font_01_sfnt_off00007ad1.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD1 1800 bytes
font_02_sfnt_off0000835e.bin
1caa6a33e4d6621d3bf47ba8c52fdc2e4e0c822a2d274ce8483b482f75feb26d
pdf-font-stream PDF embedded font (sfnt) at offset 0x835E 15112 bytes