Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b90fc3b31808dda…

MALICIOUS

PDF

40.7 KB Created: 2020-08-12 02:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd8229e4807ad907a15a37701379d46f SHA-1: 86253ffca65365d4a24ffb509694e05c97f4375a SHA-256: 4b90fc3b31808dda3421cb9704c89c0c2d70f209053a4da9ec278297fd581f13
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.cc'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL, suggesting the primary intent is to redirect the user to 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.cc/pify?keyword=acquisition+finance+tom+speechley+pdf
    • http://files.bellmereonrichards.com/uploads/1/3/1/1/131164460/468816.pdf
    • http://files.saintlawrencewr.org/uploads/1/3/1/4/131453255/4741528.pdf
    • http://menuvu.anclotedesign.com/uploads/1/3/2/7/132740405/7908259.pdf
    • http://dinuzob.caveofpixels.com/uploads/1/3/1/3/131383657/xiposawixim.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/44994837853.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2799/files/simuguwikeku.pdf
    • https://cdn.shopify.com/s/files/1/0433/9171/3447/files/17005044237.pdf
    • https://cdn.shopify.com/s/files/1/0428/1240/7967/files/zafujagezuboburu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/physical_properties_of_alkenes.pdf
    • https://cdn.shopify.com/s/files/1/0440/9245/7112/files/manual_drip_coffeemaker.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/inflammatory_bowel_disease_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/milazagadivasejufubexewig.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4624/files/discord_terms_of_service.pdf
    • https://cdn.shopify.com/s/files/1/0440/1784/4382/files/pedolasiwulidosofikinog.pdf
    • https://cdn.shopify.com/s/files/1/0439/3402/3848/files/37146587660.pdf
    • https://cdn.shopify.com/s/files/1/0431/8976/4245/files/23607787260.pdf
    • https://cdn.shopify.com/s/files/1/0434/0996/5212/files/dukojojozelawubuxepuva.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/doctor_strange_hd_online.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_off0000537d.bin
53a2ffaeb9f4c58b288b707db9a320741c275a3c983c2c1bdff094c3b7a9a350		 pdf-font-stream PDF embedded font (sfnt) at offset 0x537D 5400 bytes
font_01_sfnt_off000065b4.bin
7182c81215e0c631b36e523998fd46ab1d12c848e59979abd48ab88b62fcb715		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B4 9812 bytes
font_02_sfnt_off0000873d.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x873D 4324 bytes

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