Malicious PDF — malware analysis report

Static analysis result for SHA-256 136511e2231bde4f…

MALICIOUS

PDF

41.9 KB Created: 2020-08-25 05:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93a8860fb8acf9e03c62386bef6f8f8f SHA-1: b3c5823e7d0259c7e65c0aea8125f19110d9a422 SHA-256: 136511e2231bde4f97648ea4c00c6e359d31ed66b17232072544879f864edeab
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including a critical finding for a redirector link to 'ttraff.com' and a high-confidence ML classification. The document body and heuristics suggest a social engineering lure, instructing the user to interact with a link or potentially copy/paste commands, consistent with ClickFix attacks. The embedded URL points to a known malicious redirector, likely initiating a download chain.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=macos+10.+15+catalina+iso+image
    • http://files.khillchurch.org/uploads/1/3/1/3/131398542/zozebatolome_nonugi.pdf
    • http://files.sequatchiecountyband.org/uploads/1/3/0/8/130813696/xasemiwijus.pdf
    • http://files.fixintorepair.com/uploads/1/3/2/6/132681033/dawowu-vaxavoti.pdf
    • http://mipozoz.authoramyrichie.com/uploads/1/3/0/7/130740025/490533.pdf
    • http://files.cruiseandtourexperts.com/uploads/1/3/0/7/130775504/76bfcc6f23a44.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/1855/5292/files/dilubonikow.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6032/files/weteme.pdf
    • https://cdn.shopify.com/s/files/1/0431/7301/9808/files/rumomi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1152/2209/files/65167296062.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/zezuboz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9922/6279/files/77100376452.pdf
    • https://cdn.shopify.com/s/files/1/0432/0421/4942/files/nejixi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8543/8883/files/kuvomosudenerasasuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/studio_background_photos_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/3152986983.pdf
    • https://cdn.shopify.com/s/files/1/0433/4944/2715/files/intermediate_algebra_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/simple_present_tense_rules_chart.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000666b.bin
27a3331f3b8f917d876bacc3dc1b8f77e46e3b0bafb00a619f830df451575060		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666B 5380 bytes
font_01_sfnt_off000078ac.bin
e467a3ec2ffeaeda1cc142818c6978a2d46abfe15ff0746647059a6d5baa96ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AC 9976 bytes

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