Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8179853d1cb1fc…

MALICIOUS

PDF

41.3 KB Created: 2020-08-02 22:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16f560d31ad3a1769e367986c2131716 SHA-1: 8bef372d9e2f32a978ba88c0d340fec42e516b4a SHA-256: be8179853d1cb1fcf046176a1cac4a6562449f56bf3030c6ea18bc2368a9f19d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of this redirection scheme. The primary intent seems to be directing users to malicious sites through a lure related to firearms.

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=hatfield+410+shotgun+walmart
    • http://files.macrosourcemedia.com/uploads/1/3/1/1/131163667/835138.pdf
    • http://files.tapintunein.com/uploads/1/3/1/1/131164081/denezetekazag-wijepaxedomisop-jaluranobofu.pdf
    • http://files.pgoody.com/uploads/1/3/1/1/131164542/6126852.pdf
    • http://files.dawnfeeneyjewellery.co.uk/uploads/1/3/2/7/132712451/budalezujexebatote.pdf
    • http://files.freedformats.com/uploads/1/3/1/8/131856626/59d3208.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/pejidufesigenadid.pdf
    • https://cdn.shopify.com/s/files/1/0427/7754/2823/files/riluku.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2089/files/28805802073.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gujogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemisavixazesunomezixe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/75596628070.pdf
    • https://cdn.shopify.com/s/files/1/0440/7423/8102/files/46287586591.pdf
    • https://cdn.shopify.com/s/files/1/0434/2041/8198/files/ruwaporuro.pdf
    • https://cdn.shopify.com/s/files/1/0440/0083/7782/files/depofef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0432/1177/files/junusemudigimoliwije.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_off00006398.bin
7116106f1bba581cf936a08619b747b00bd2b899f874923053aa64d2dc67a098
pdf-font-stream PDF embedded font (sfnt) at offset 0x6398 5656 bytes
font_01_sfnt_off000076c2.bin
e9a051f400d9b5c37c326d0a113e5a524b28d9d070dcc6dbba0e99c749face6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x76C2 9964 bytes