Malicious PDF — malware analysis report

Static analysis result for SHA-256 42eedad26ee127dd…

MALICIOUS

PDF

38.9 KB Created: 2020-08-29 14:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 348eeb347807d593cfa879beb4b4357e SHA-1: 311ba3094164c038aa0f42d1ea302c8d5abe6a9c SHA-256: 42eedad26ee127dd6fce888ef54a4485ecff6a29f050ea620404061babc28f2b
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector, suggesting the document's primary purpose is to drive traffic to malicious infrastructure. No scripts were extracted from this sample.

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=blackpink+boombayah+song+free
    • https://static.usrfiles.com/ugd/b8c837_f521d7e0de444cb08eeb6e89e57dbc35.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ab2000b8d6042e19db345e48f2bcbda.pdf
    • https://static.usrfiles.com/ugd/6da380_2473418f763947ee99ae19e0a33b4f97.pdf
    • https://static.usrfiles.com/ugd/b8c837_b82d6f5d1dbb47118c68a5ff1168ab42.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8176/files/giwixijojavabutomipuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2501/files/sternal_precautions_occupational_therapy.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/losawogitifupu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3164/1767/files/68975482049.pdf
    • https://cdn.shopify.com/s/files/1/0430/8015/5289/files/28812135705.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1641/files/virikenaguwani.pdf
    • https://cdn.shopify.com/s/files/1/0462/3925/2631/files/xakofajidujejizimam.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/lunavizusadezofinip.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/misetoziwonegawozabo.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1288/files/engineering_fluid_mechanics_9th_edition.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_off00004f59.bin
7c6911e325306f8195ac594a8aab21572ff94556ae817b97bdb83240c7a14c22
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F59 5784 bytes
font_01_sfnt_off000062e3.bin
181c18c2b25692df3eac6b6d9ee54b63b192f6ae8063bf85c6e4739f038364cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x62E3 14240 bytes