Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a80ff7f428661f9…

MALICIOUS

PDF

33.5 KB Created: 2020-08-31 09:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb125e23a7874ef70228e457e9bdd658 SHA-1: 40d7bbfc7dfd489edcb4b5eb32124db2b42c92cb SHA-256: 7a80ff7f428661f91fbb41291ccfbabbbc584c0a95a305adcc22a373afafdcff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the target URL and a reference to 'Middle earth map hd', suggesting a lure. The presence of numerous other PDF links, many hosted on Shopify and static.usrfiles.com, indicates a link farm strategy, potentially for SEO poisoning or distributing further malicious content. No scripts were extracted, but the ML classifier 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/wix?keyword=middle+earth+map+hd
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/volowuzisakosavarup.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/hot_air_balloon_coloring_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/8787/9580/files/rafenu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0216/5410/files/gezixuxiwemil.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/area_of_trapezoid_worksheet_grade_4.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f200ab4ebdb4b10b98f773635ebf639.pdf
    • https://static.usrfiles.com/ugd/3649d2_23635f47baf640c9a32b4bbf15498faa.pdf
    • https://static.usrfiles.com/ugd/934fc3_7c662094c5784390a268243e3031139d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ed5dcf84bea4e1887ed27bc043eac2f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a745e7b5bce49218425f295abe35c3d.pdf
    • https://static.usrfiles.com/ugd/405339_f2de7bb2eac24b5cae06da5b1f804360.pdf
    • https://static.usrfiles.com/ugd/99afdc_56d2f22256884591a756ba787b324aa5.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_off000045f6.bin
26c3533c31c8518fede0bc9b088eb6ea4cc2307619575a85dfdb9f56d6126201
pdf-font-stream PDF embedded font (sfnt) at offset 0x45F6 5024 bytes
font_01_sfnt_off000056e4.bin
bf4e30e6805cdbb529a8f5a22ac65cc67a79bbb30f4a5756079e5c52351eb322
pdf-font-stream PDF embedded font (sfnt) at offset 0x56E4 10212 bytes