Malicious PDF — malware analysis report

Static analysis result for SHA-256 4837de038eb9d083…

MALICIOUS

PDF

40.5 KB Created: 2020-08-21 19:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2162a931b0c84a8b314f3eb42b27bfec SHA-1: 0a7f63d95a90dccb7f7b363cd149f2d28948c8ee SHA-256: 4837de038eb9d0836262bed7dda4806f68246abd0cbc8e08bf8820bcfd89acb1
154 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a large number of embedded links, many of which are hosted on Shopify but ultimately lead to a redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring the user to click on these links, which likely lead to a malicious payload or phishing site.

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=alien+3+imdb+parents+guide
    • http://debosa.flamintips.com/uploads/1/3/2/7/132712663/45270225a.pdf
    • https://cdn.shopify.com/s/files/1/0434/5354/6656/files/88760275955.pdf
    • https://cdn.shopify.com/s/files/1/0427/8566/9279/files/dasokumamabuzakededov.pdf
    • https://cdn.shopify.com/s/files/1/0428/7604/3423/files/61677195844.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/vatakurijozuzutira.pdf
    • https://cdn.shopify.com/s/files/1/0440/7784/2584/files/wivivamofuvilapa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/wozekejugug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19189676900.pdf
    • https://cdn.shopify.com/s/files/1/0435/4686/9911/files/what_is_the_strongest_element_in_prodigy.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/tuzoxegen.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_off00005f6a.bin
21291d69957265517827cbed81d6a83923babddab9e0bf0c50db7fe4fe57aa31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6A 5572 bytes
font_01_sfnt_off00007232.bin
14b4cffae74daf51d7f7ba5fb3913fc65ce0f9b48910453232cd2c93b18150b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7232 10496 bytes

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