Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ed76d5117272e2…

MALICIOUS

PDF

48.7 KB Created: 2020-08-29 07:39:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd93972d4b99b3ccd03427aee9d8439d SHA-1: f49cbe78f10e857c5b65baa2612625c3b1be67b8 SHA-256: 38ed76d5117272e2e0794165c88bc7cde4893cddbdfcc7b6be6b48497df1ff8d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to download potentially malicious content. The ML classifier also strongly indicated maliciousness. The presence of numerous other PDF links, as flagged by the PDF_SEO_LINK_FARM heuristic, indicates a potential link farm for SEO poisoning or distributing further malicious content.

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=descargar+juegos+portables+para+pc+1+link+por+mega
    • https://downloadgamespcgratis.c
    • https://static.usrfiles.com/ugd/b8c837_7056f474405147048f057f18428ca38b.pdf
    • https://static.usrfiles.com/ugd/b8c837_da10094c12d44a4fa5e140784bde7f72.pdf
    • https://static.usrfiles.com/ugd/b8c837_f035f8eec18649eebf6ec9c77deffc04.pdf
    • https://static.usrfiles.com/ugd/b8c837_67b9ccdada164c6a900a4d6c5e32945d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0b383423ed14af883722d3230e515f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_71b25bbc11e94eb78bd48f2cc8be4b09.pdf
    • https://static.usrfiles.com/ugd/b8c837_016fe89a5c6f48dd88ed8aa3cbc97484.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/indorama_ventures_pcl_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2046/files/22129589543.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/27128373893.pdf
    • https://cdn.shopify.com/s/files/1/0440/1247/0422/files/job_offer_acceptance_letter_sample.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e2c78a851af4a08a5cf2b4aa5e31d22.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a73af7e2b0f4ecca4c2399887728be6.pdf
    • https://static.usrfiles.com/ugd/b8c837_349c252372984fe9b3410c02ef022d81.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0fa4db60b674a3388cc40222cdd71c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b10f1ca66d2d46b0a9a5e89f3e9c9169.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000646f.bin
c831c0099bffbf94db1c9580b4cb35a0384fd9e709a536bff0a7677d877bee30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x646F 3312 bytes
font_01_sfnt_off00007033.bin
c603553f22e5a7c95e5a513ee41b7091e41c95ee575f9e0af5153b75b85937df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7033 5584 bytes
font_02_sfnt_off00008328.bin
547dd4fc7529cb4e1856baa031ca3c4478e2568ed4cafdbc3f1f554a17e3fdc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8328 15740 bytes

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