Malicious PDF — malware analysis report

Static analysis result for SHA-256 833ca7928554242e…

MALICIOUS

PDF

42.7 KB Created: 2020-08-30 14:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce6b690247450f4bf7401bd57b2f17b1 SHA-1: 26150aba24c546a919fa34438f5b4cef8f1b9d1c SHA-256: 833ca7928554242e17a41c2a1e9e3dbbcc7cb69f843f0fa067a453e4eddb77ce
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to a URL that includes a keyword suggesting a game download. This URL is also present in the document body. The file also exhibits characteristics of a PDF link farm, with numerous external links, many of which point to benign content but are likely used to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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=summertime+saga+download+pc+0.16.1
    • https://static.usrfiles.com/ugd/b8c837_03fabe0c4f734b85b60c8473cbeac064.pdf
    • https://static.usrfiles.com/ugd/b88e3d_b0c472b4b281446a8b1a07f26bc7301b.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5457bbe5509467abd543692feda57f7.pdf
    • https://static.usrfiles.com/ugd/b65acf_ed88dbe71ee24d70b6bafa4dd55665ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d850ccd029d4e1cb951f54a314fe7d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_60f941783ff54948925393a1e465d837.pdf
    • https://static.usrfiles.com/ugd/b8c837_06a290a14c7b4918819c938994945933.pdf
    • https://static.usrfiles.com/ugd/b8c837_15391b1509634ac7be1bed88aeae6e23.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1860/files/gazefetenijuforupo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8204/5858/files/la_petite_sirne_histoire.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7569/files/pejawukuxebojafuvig.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5763/files/bangla_book_class_7.pdf
    • https://cdn.shopify.com/s/files/1/0450/5151/0936/files/fintech_malaysia_report_2017.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/aspectos_psicologicos_del_puerperio.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2309/files/xabuwunaxifoxomiru.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_off00006663.bin
c42493b4821013f424d2324fb6356342cc8d867d827a204d257269bbd7a0dde9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6663 5968 bytes
font_01_sfnt_off00007aa9.bin
08370cfc235b3b128af8475e138e39eff23432482a3d641f3e112512cec14c0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA9 10368 bytes