Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5629e1b185394fb…

MALICIOUS

PDF

37.3 KB Created: 2020-08-29 03:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6f8dde2260df8f28c9f514304eb2434 SHA-1: ca4b732b62eeff09ae46782ef22e0f60a5b938af SHA-256: c5629e1b185394fb574820a6eb4016f1743f299358b401ae51efbfa5ef51c0aa
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent link leading to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be luring the user to click a link that leads to malicious infrastructure.

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/wix?keyword=prayer+of+st+francis+song+lyrics
    • https://cdn.shopify.com/s/files/1/0452/1564/5856/files/jakupuji.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1617/files/ashrae_standard_34_2020.pdf
    • https://cdn.shopify.com/s/files/1/0465/2197/4934/files/barcelona_vs_real_betis_3-_4.pdf
    • https://cdn.shopify.com/s/files/1/0428/8803/6505/files/rorolirijemilir.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/mamug.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6741/files/wefagijesugajufuwof.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/matter_and_interactions_3rd_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/4462984468.pdf
    • https://cdn.shopify.com/s/files/1/0447/8153/5389/files/possessivpronomen_latein.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/how_to_fetch_a_branch_from_github.pdf
    • https://cdn.shopify.com/s/files/1/0432/8466/0380/files/nafagajugaxogewunejases.pdf
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/wirimipesutorolubakovek.pdf
    • https://cdn.shopify.com/s/files/1/0438/1592/7965/files/cavaleiros_do_zodiaco_omega_dublado.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1862/files/29760153656.pdf
    • https://cdn.shopify.com/s/files/1/0436/5837/9417/files/tumblr_audio_chrome_extension.pdf
    • https://cdn.shopify.com/s/files/1/0438/1927/0306/files/vowajekaxesevuvapo.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_off000054e1.bin
01c994c2c9e2c9e378dad69a14588effb4a6046490c6114cc72171898bb1bc2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x54E1 5152 bytes
font_01_sfnt_off00006676.bin
0424c51dcc1ccd964ae305b0d5265cd8c7b56777a14d8ec9ea74c71bf4f3794e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6676 9956 bytes