Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb02fb1a70934044…

MALICIOUS

PDF

39.8 KB Created: 2020-09-15 23:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d34b3c0fb8dc2cc9134f27df089446d6 SHA-1: 78f554bb37734dbf83744b666db5a07dec31e1ec SHA-256: cb02fb1a709340441f84a1ebbc5f55c991284bab1b68b4a1e76b15032f13c516
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, which points to a lure for downloading an NBA 2K17 APK. The document body, though heavily obfuscated, contains the same URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm used for SEO poisoning or distributing malicious content. No scripts were extracted from this sample.

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.club/pify?keyword=nba+2k17+apk+obb+200mb
    • https://cdn.shopify.com/s/files/1/0435/6544/9371/files/pobokoninosadexobiduw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2924/9694/files/ubuntu_network_disabled.pdf
    • https://cdn.shopify.com/s/files/1/0432/1309/5073/files/kakanedusavitivajobaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/japibok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9013/3663/files/wisataberilepufurifar.pdf
    • https://cdn.shopify.com/s/files/1/0484/9260/9686/files/watch_the_amazing_spider_man_cartoon.pdf
    • https://static.usrfiles.com/ugd/2eedf1_bd3a3d5a36df433797b22066db790f27.pdf
    • https://static.usrfiles.com/ugd/5b5da7_5d62ce03fbc144b1b29f6e4dd5b3420b.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f2e5d2036c146418585a26300aef531.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_off00005fea.bin
8bff510828657c149080d9939f53fa6c7b942009ea77d5c9eecb751bacd42bbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEA 5236 bytes
font_01_sfnt_off000071c1.bin
e927f5d0eba59e3ae13d29c47486b9d53fb94ebcd9983a34bb5eb0b19701eebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C1 9772 bytes

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