Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad84ede1673e764…

MALICIOUS

PDF

37.8 KB Created: 2020-08-25 18:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7c659b13342b76c58ee995957e0fb20 SHA-1: aa1de486b937e1bff6450296bc5030c6f3a0fbbe SHA-256: aad84ede1673e764db63b1d2708855b0b8112e6f7ea7d977e5b86187a028bab4
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary malicious URL, https://ttraff.com/pify?keyword=rc+transformer+coloring+pages, is part of this redirection scheme. The document body, though heavily obfuscated, contains references to coloring pages and the malicious URL, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=rc+transformer+coloring+pages
    • http://bolufuwi.songbirdhealingcrystals.com/uploads/1/3/2/7/132740214/8848771.pdf
    • http://sugiduz.madhatterspopcorn.com/uploads/1/3/0/7/130740189/sixuxavajovakij-vitirexun-wenogi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2752/1948/files/nadenogazusixejefa.pdf
    • https://cdn.shopify.com/s/files/1/0435/3707/2280/files/kugugigupivasowadesu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/navy_seals_songs.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/85651233433.pdf
    • https://cdn.shopify.com/s/files/1/0440/7705/6165/files/tapinifunodabeli.pdf
    • https://cdn.shopify.com/s/files/1/0437/3633/4501/files/gizuzinapavodozimux.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/archaebacteria_characteristics.pdf
    • https://cdn.shopify.com/s/files/1/0433/7028/3166/files/rasidezemutumuradufimajep.pdf
    • https://cdn.shopify.com/s/files/1/0433/8214/5182/files/9666879667.pdf
    • https://cdn.shopify.com/s/files/1/0433/4524/8421/files/posoxigatubuzorisugem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000499f.bin
9846f0e19b63fed429c6acc0769ff0887c96beddf8589aaf0c8416bf9c32ddc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x499F 5128 bytes
font_01_sfnt_off00005af0.bin
bac24c17c76a5c47c6053a6a31f93c30cd6138b1b2ae170fdb22f3df593bcaea
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF0 9808 bytes
font_02_sfnt_off00007c83.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C83 4324 bytes