Malicious PDF — malware analysis report

Static analysis result for SHA-256 159f9ddd02c04594…

MALICIOUS

PDF

48.3 KB Created: 2020-08-31 02:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71da4e484c3eee0fc7b0b695e8f88527 SHA-1: f7438468a85fc4c03041f7f45161180658eab9d9 SHA-256: 159f9ddd02c0459474850385ef36ca49ed85f1dacd887f77dea7685b92c474b4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to a link farm designed to host other PDFs. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=certificate+of+appreciation+for+dona', suggesting a social engineering lure to trick users into clicking the malicious link. 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.cc/wix?keyword=certificate+of+appreciation+for+dona
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c1615c_4490bb5d86f944efbea1f8bce32f9e14.pdf
    • https://static.usrfiles.com/ugd/b8c837_c046e6c9db3f4ae79f7e44e1e978235e.pdf
    • https://static.usrfiles.com/ugd/08fe48_7e865f78c13f4f55b33e83dfcfd10f8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_006d4e787088457b9cadd742c8512cb0.pdf
    • https://static.usrfiles.com/ugd/d01287_2cc2f5b5732f42ba83f8f84ef38962b4.pdf
    • https://static.usrfiles.com/ugd/856cea_b351c05bec924de18d903a8850c1d9d8.pdf
    • https://static.usrfiles.com/ugd/d902bb_0884d1306c5948fe9f956f712513df09.pdf
    • https://static.usrfiles.com/ugd/7ff653_4c079a35009448168ad183881fe817e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a33d3cda790a4d43ba951291a5ab1ebf.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_492b3267b7b64e41b3aecaf4d15e29a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_64d4c30f99834af4941a77d1891491d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_c26904b176ba4d1dbcdc386cbf40fb12.pdf
    • https://static.usrfiles.com/ugd/01e791_a083cb9832354ebbb32d06e8bd05326e.pdf
    • https://static.usrfiles.com/ugd/0dd040_423ef2c4c3f4423f99daf15fdd2505c6.pdf
    • https://cdn.shopify.com/s/files/1/0461/7135/7336/files/38094826442.pdf
    • https://cdn.shopify.com/s/files/1/0434/1510/9799/files/28897324456.pdf
    • https://cdn.shopify.com/s/files/1/0433/8434/0630/files/falozekaweduzi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4788/6743/files/lefipefosoperokajugokep.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/logitech_k810_manual.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e93.bin
016575affc9515bc7c9810e7615a4cf304c4b18e097442def5a5dfa695656b63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E93 4844 bytes
font_01_sfnt_off00008f10.bin
0ac044f2afa141c4972e6d380c7ad10a1e4725cec779c7d60a0a7aa86927b442		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F10 10616 bytes

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