Malicious PDF — malware analysis report

Static analysis result for SHA-256 38dd23ae754a3a39…

MALICIOUS

PDF

44.1 KB Created: 2020-09-06 14:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22e9bce56713c604378611d13bbf643f SHA-1: 164caa52378895c4fb34acd180b048c22d9740b0 SHA-256: 38dd23ae754a3a39ce4d1fddc14136406f8ce264b4c2a1674f01e2d61e7bb253
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it's a redirector link to a known malicious URL. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify and static.usrfiles.com, likely intended to manipulate search engine results or distribute further malicious content. The primary malicious URL identified is https://ttraff.me/wix?keyword=ancient+cities+game+free, which is likely the initial lure or part of a phishing campaign.

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.me/wix?keyword=ancient+cities+game+free
    • https://cdn.shopify.com/s/files/1/0440/7279/6325/files/rinetose.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9384/files/mopavafunetol.pdf
    • https://cdn.shopify.com/s/files/1/0440/7204/2661/files/4389115705.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/bastards_of_istanbul_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9581/7382/files/pegibisapifejuzajupanadul.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/machine_design_an_integrated_approach.pdf
    • https://cdn.shopify.com/s/files/1/0435/2075/3823/files/english_tagalog_sentence.pdf
    • https://static.usrfiles.com/ugd/a42eed_66c7098f27a44833b909fed3314928f6.pdf
    • https://static.usrfiles.com/ugd/3aee12_2d23709923e840688af3c1bed4decb13.pdf
    • https://static.usrfiles.com/ugd/850f07_edda2871653742d989e37c67b7d559af.pdf
    • https://static.usrfiles.com/ugd/79cb75_7cab588c391a41d8834f717d03179a69.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_5af50ebce5bf41469c77f40944353e28.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c129ede45344c8f9c428e1332799957.pdf
    • https://static.usrfiles.com/ugd/73cb9e_13744dc874d045c09e9a60482090a01b.pdf
    • https://static.usrfiles.com/ugd/113e89_3e4c7ddfac8449bbb5cc4821bbaf9623.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_off00006f2c.bin
02efccd000acbc63fd4d09f1ad8b1e69476dc1d502cddbb38bea91022bc32a15
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2C 5156 bytes
font_01_sfnt_off000080a6.bin
d5c203f50067eb63563d26bf72d2feae1c242cda872c761e6e3a1fabab76da04
pdf-font-stream PDF embedded font (sfnt) at offset 0x80A6 10268 bytes