Malicious PDF — malware analysis report

Static analysis result for SHA-256 92272f58f9aaf70e…

MALICIOUS

PDF

43.6 KB Created: 2020-08-31 13:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db31868ef357c286d0380ce976279990 SHA-1: f4cf1d1820bcc1de636ff5936737fdba489a69e2 SHA-256: 92272f58f9aaf70e1417ccb501620aad05b4a600df953639d28efa5b7b637255
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector infrastructure at ttraff.cc. The document body, though heavily obfuscated, contains the same URL, suggesting the primary purpose is to redirect the user to malicious content. 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=ryan+reynolds+definitely+maybe+headphones
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/80276315887.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/jodofiriwuwafozaxuxarutex.pdf
    • https://cdn.shopify.com/s/files/1/0427/8606/2495/files/judezajat.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8775/files/o_avivamento_do_pais_de_gales_livro.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa1e322809b548269fa5bd30a424d21d.pdf
    • https://static.usrfiles.com/ugd/934fc3_2e87f0d1643e4cfcbce28ddbe2849540.pdf
    • https://static.usrfiles.com/ugd/7f929b_9b00f580866c451297f4926699e1ee84.pdf
    • https://static.usrfiles.com/ugd/834936_41863b2a4d404948ae9176e08359b766.pdf
    • https://static.usrfiles.com/ugd/1849a1_4cfc467273324d728a4a38d18cbd3667.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/narusugugeguzoxomig.pdf
    • https://cdn.shopify.com/s/files/1/0432/0139/6896/files/arya_2_malayalam_movie_song.pdf
    • https://cdn.shopify.com/s/files/1/0433/4390/4927/files/vezadesojimumidex.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/37578992260.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_off00006abe.bin
da255c44b070d87c405c82e922bde21e453471dedf367593dc4fc5f5cef2cfaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABE 5528 bytes
font_01_sfnt_off00007d66.bin
20dbc9043d862be93a2971b228a71d98f610487996017df31cb8dc98718747b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D66 10672 bytes