Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24b02117e956d6e…

MALICIOUS

PDF

36.7 KB Created: 2020-09-19 12:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4484d4b4d2796a93cb3ced2c20d0f9e SHA-1: 0c36d33b9d0231c6741c5d408948df2cf9814216 SHA-256: a24b02117e956d6e8a261147e49f8ff9cbffcb449183b4ed42b0a55478188ebd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'human impact on ecosystems worksheet answers', suggesting a lure to trick users into clicking the malicious link. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the presence of multiple links and the redirector heuristic strongly indicate a phishing or redirection attempt.

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=human+impact+on+ecosystems+worksheet+answers
    • http://tiwizivu.townofharmony.org/uploads/1/3/1/6/131637814/8731711.pdf
    • http://famez.williamdbryan.net/uploads/1/3/1/4/131453453/makewomeduwatorime.pdf
    • http://mowuw.bagelanddeli.com/uploads/1/3/0/9/130969423/6332151.pdf
    • https://4cf566e7-639e-40f5-9bec-89d4e9d05278.filesusr.com/ugd/4329d7_b90cb498213f4ad0a85970ada34dc373.pdf?index=true
    • https://11d2719a-2523-42d9-97a2-11d58b198f90.filesusr.com/ugd/938c70_220cbb14e4d14c4ba66635fb60737ef5.pdf?index=true
    • https://559598a0-b677-4423-b39f-b69e48fa16d9.filesusr.com/ugd/f9fac6_db545ff7536541b483c84bfec17337d2.pdf?index=true
    • https://bb422eb6-5dd3-493b-bcc6-b34331318e9f.filesusr.com/ugd/fb5067_67d1939ad748423ba7284c0c0f9ca9f0.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/azoteas_verdes.pdf
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/36044348240.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1841/files/81842195926.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2906/files/gate_2020_syllabus_for_mechanical_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5280/files/swagbucks_live_answers.pdf
    • https://22b0e2af-73df-4248-895c-b488aeb6eed1.filesusr.com/ugd/bcd086_bd4fad065b7643419cd6e1dccbb716c5.pdf?index=true
    • https://c6c9f37e-caef-4ff2-917b-7d2f9ed2479e.filesusr.com/ugd/227d0f_16619362e56f43238c9ad1f46818c79a.pdf?index=true
    • 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_off0000523e.bin
d97b03174872b112f6744a1d62cf792f58ed22ebc64b268043b16baae835d992		 pdf-font-stream PDF embedded font (sfnt) at offset 0x523E 5360 bytes
font_01_sfnt_off0000645c.bin
10004ac689e2fa4808cf15a8c849fe049bcdfd892f5170aae69cb226d90ad680		 pdf-font-stream PDF embedded font (sfnt) at offset 0x645C 9820 bytes

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