Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c36056b77c838a…

MALICIOUS

PDF

47.8 KB Created: 2020-08-30 09:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07ec34dd84bbf38189fed2177f3e41fd SHA-1: b2d9a4da166e5f7271aa2547d76c69a63a104d63 SHA-256: 44c36056b77c838a29ca7ad65fc12c59b65d7d1b79ad42b88b9c6d9f72bdeeb6
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. Another critical heuristic indicates a PDF link farm, with many links pointing to static.usrfiles.com. The document body is heavily obfuscated and contains the malicious redirector URL.

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/wix?keyword=climate+changed+squarzoni
    • https://static.usrfiles.com/ugd/5b604d_348353c8c14b4ef6af93d57c7f983f4d.pdf
    • https://static.usrfiles.com/ugd/a107db_0b3a18a723f84bc08de2f03a28a01e42.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_1ae5e707d0814f4b852ffb72038593a6.pdf
    • https://static.usrfiles.com/ugd/67f5f7_cf55dc260fd9435280fbfc9a9023d717.pdf
    • https://static.usrfiles.com/ugd/6cfc61_d7598b829633487b9889dbda5d41086e.pdf
    • https://cdn.shopify.com/s/files/1/0430/3909/6986/files/felozolame.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/76386355681.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4689/files/bofuzujelidoj.pdf
    • https://static.usrfiles.com/ugd/bb13a2_7682362f61ef4d2fa7e9e0301d759f56.pdf
    • https://static.usrfiles.com/ugd/87a178_442465fe44a94ff2a39174763debf028.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_9413d577a31c4465a0d651504b1f278c.pdf
    • https://static.usrfiles.com/ugd/b8c837_86fce33d88d24af9b0187d99524497b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d9df525fec94099a8c97dcaba23c6f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_305de594db164e7fbf09200932dfe48d.pdf
    • https://static.usrfiles.com/ugd/c068f8_b7a7aae7cf91467db5e1a18cd0f1ce0c.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_off00006820.bin
b598962ced8f68f647304a75073f6b9fd5c36f64b8050c8effb04b5ae4221a54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6820 5436 bytes
font_01_sfnt_off00007a6a.bin
212448ddaa7a069503f3b0b66d0e0a3cc0de2076a01f9eddd9821c111db71772		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6A 10288 bytes
font_02_sfnt_off00009da6.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA6 16092 bytes

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