Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae94a2fbb0656b63…

MALICIOUS

PDF

42.3 KB Created: 2020-09-07 02:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6d8f6e53312b1c4a838e3dd8173a7b8 SHA-1: 640ab02d0760e7f6d162afdc6c6bd310f7041bc8 SHA-256: ae94a2fbb0656b63c30ccba9584bfcaa8ae03f99ad16ce6539790efa2829dfbf
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector, indicating a phishing or scam attempt. The document body, though obfuscated, includes the target URL, reinforcing the malicious intent. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of specific execution behaviors.

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=communication+research+reports+acceptance+rate
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/3d_football_games_for_java_320x240.pdf
    • https://cdn.shopify.com/s/files/1/0437/9197/4557/files/42238358561.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/rewodebuzozagugomumamano.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/89107333855.pdf
    • https://static.usrfiles.com/ugd/b8c837_6284ee5ef7f74cc293fa6d99cbb42d45.pdf
    • https://static.usrfiles.com/ugd/55cc32_2ba93a3506074a3a83a031566608a976.pdf
    • https://static.usrfiles.com/ugd/1ebe14_4e1d10187038466699a8d72959c6ba9e.pdf
    • https://static.usrfiles.com/ugd/1813b3_e365eb53c39e4d48a9ff55936bb3bf42.pdf
    • https://static.usrfiles.com/ugd/96768c_1469938fb97f48b5b7c143088c4a1289.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3384/files/ielts_trainer_listening_test_3_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/4954/1013/files/xovapivazonofufulejajuto.pdf
    • https://cdn.shopify.com/s/files/1/0433/0402/6280/files/calidad_de_vida_peru.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2709/files/ethiopic_amharic_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/21327874939.pdf
    • https://cdn.shopify.com/s/files/1/0432/0700/0219/files/49717067860.pdf
    • https://cdn.shopify.com/s/files/1/0464/6921/8454/files/linking_verbs_worksheet_3rd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0448/3871/5552/files/google_calendar_raspberry_pi.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_off00006788.bin
d19fcd2d3221b47570195febc0bc5f61611a754b0e412a02b09be28ccf79641f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6788 5048 bytes
font_01_sfnt_off0000787f.bin
ca8ff26294caf1d6efe8c2072bbbacd14a8c9d54edad2fbee785b71a507c4134		 pdf-font-stream PDF embedded font (sfnt) at offset 0x787F 10440 bytes

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