Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dabcd940a3833e4…

MALICIOUS

PDF

119.7 KB Created: 2020-08-07 22:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b71c19b26ca2368ca4fdf1ea2160d3bd SHA-1: 5adee8bf750918c77d7a7250c59f3ca09dafeb52 SHA-256: 0dabcd940a3833e41b9fb659232aebefa7aae02e4212825938260f47dd5a9950
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to '8th grade vocabulary test pdf' and the malicious URL. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to obscure the malicious redirector.

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=8th+grade+vocabulary+test+pdf
    • http://files.judith-castro.com/uploads/1/3/1/6/131606331/5703602.pdf
    • http://files.chambleecharterhighschooljrotc.com/uploads/1/3/1/4/131438718/kofez-tavemepupa.pdf
    • http://files.pathuberartwork.com/uploads/1/3/1/0/131070733/1992815.pdf
    • http://files.draff.net/uploads/1/3/0/7/130740166/8461961.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9586/8067/files/github_cherry_pick.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81159011373.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5702/files/suvudexotolizuwejusala.pdf
    • https://cdn.shopify.com/s/files/1/0435/8628/9832/files/proyectos_de_techos_verdes.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/70273492740.pdf
    • https://cdn.shopify.com/s/files/1/0432/4913/9880/files/bopux.pdf
    • https://cdn.shopify.com/s/files/1/0435/3723/6119/files/protected_file_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/6019/9573/files/kci_wound_vac.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/46614377503.pdf
    • https://cdn.shopify.com/s/files/1/0433/2368/7067/files/18835019089.pdf
    • https://cdn.shopify.com/s/files/1/0429/2686/6599/files/49170721297.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7961/files/stone_sour_miracles_lyrics.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_off00019b6e.bin
abed2e252d59489c3f3859396978e6090821b75ca42f6cfc48e7805a5fd45c0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x19B6E 5816 bytes
font_01_sfnt_off0001af3e.bin
132cca7a2b659de587dae262db9c2eafd01e00948d9417e1a5c9ea0cead83928
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF3E 9920 bytes