Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff4cacda9a0a734…

MALICIOUS

PDF

43.0 KB Created: 2020-08-31 05:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df60598d6a0aeed6ab1074fb382585f6 SHA-1: 3a91cc99d42846dacbca94cc0003519e44ffdad4 SHA-256: 4ff4cacda9a0a734bd02e794fe6373afb7feee8f365382388dc45eb268c286e8
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, suggesting an attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness. The presence of numerous Shopify links, while mostly benign, contributes to the overall link farm characteristic.

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.me/wix?keyword=photoshop+porque+um+sofn+dqt+ou+dht
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/zopepedeluxomin.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/camera_360_ipad_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/3680/1184/files/62828868648.pdf
    • https://cdn.shopify.com/s/files/1/0433/9354/8444/files/zinozimelemodarumex.pdf
    • https://cdn.shopify.com/s/files/1/0433/3115/8175/files/procdure_amlioration_continue.pdf
    • https://cdn.shopify.com/s/files/1/0439/1721/3851/files/rewefatigexu.pdf
    • https://cdn.shopify.com/s/files/1/0439/6033/6542/files/reisgids_voor_paardenschoenen.pdf
    • https://cdn.shopify.com/s/files/1/0433/3223/9528/files/apartheid_in_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0435/3074/8055/files/86945306728.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/bluebeard_fairy_tale.pdf
    • https://cdn.shopify.com/s/files/1/0433/0956/4068/files/vamolopugalexixa.pdf
    • https://static.usrfiles.com/ugd/625844_750e34ef8eca4fe4b7dc902532b30a06.pdf
    • https://static.usrfiles.com/ugd/0c41e7_4b4aea4ed8ca4110a1cb57448af7f76d.pdf
    • https://static.usrfiles.com/ugd/fac845_4d061a0af0294cdebba4a2d3965de1bd.pdf
    • https://static.usrfiles.com/ugd/32acb1_964d2224ea564a2fb37dea1e9e13235f.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_off00006a28.bin
9bbde0a46fdac01d47029256ec6054fe67a51eee4bec9aaeafb12989572af309
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A28 5168 bytes
font_01_sfnt_off00007b99.bin
d3ff05b83378f31fbb48a72b144dcf2cfc5530e0952d40b703e03b2d30ae98b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B99 10480 bytes