Malicious PDF — malware analysis report

Static analysis result for SHA-256 927cc7bfebb309a8…

MALICIOUS

PDF

45.0 KB Created: 2020-08-01 14:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e610f3ef8b33474c595b93999569098 SHA-1: 2b63a440f5c1c242a3c7a50427679c96d2469a8e SHA-256: 927cc7bfebb309a86b27238e12efd1d0ef5bad13d599bde45189628d41504cd5
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to ttraff.com, indicating a malicious redirection attempt. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary purpose is to trick the user into clicking the link. The ML classifier strongly supports the malicious verdict.

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=vampire+the+masquerade+pdf+free
    • http://files.anlageskincare.com/uploads/1/3/0/7/130739517/487775.pdf
    • http://files.texascityhschoir.com/uploads/1/3/2/7/132740413/wulaloda_gutof_motezovodol.pdf
    • http://files.nspdkincbetalambda.org/uploads/1/3/1/4/131406274/gumekekisuka.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8180/files/41831626303.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/46856807563.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/vuveparamanopan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/14981909947.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/66932941356.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/47651287707.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1860/files/24645607917.pdf
    • https://cdn.shopify.com/s/files/1/0431/8537/3333/files/18563600985.pdf
    • https://cdn.shopify.com/s/files/1/0434/4302/8120/files/ralakovumezetafilu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4977/1427/files/11567536965.pdf
    • https://cdn.shopify.com/s/files/1/0429/5488/3231/files/73606721878.pdf
    • https://cdn.shopify.com/s/files/1/0433/2103/2859/files/54177276152.pdf
    • https://cdn.shopify.com/s/files/1/0431/9245/1232/files/zemukomuworexu.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_off000071c2.bin
0f1eee8a8b0675c350c301bb5a55c376d5b0d787ec2dfe727e01ae920bf1be63
pdf-font-stream PDF embedded font (sfnt) at offset 0x71C2 5340 bytes
font_01_sfnt_off000083c4.bin
c3d47a46df05e3fbce74696b67a3919a1ebebd25db1fb9f2e31052480da819c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x83C4 10352 bytes