Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5048abe9a98ac1…

MALICIOUS

PDF

37.3 KB Created: 2020-08-12 07:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c70ba39af57bc02c2b3751c995f3cdd5 SHA-1: 76f84cdba79981a279f0126db24000068ec464fd SHA-256: bc5048abe9a98ac1a92a14d90287afc8196a3bc2b648af5ce5a1845a216c3c1b
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, ttraff.com, disguised as a psychology test bank. The ML classifier strongly indicated maliciousness. The document body, though malformed, contains the URL and keywords suggesting a lure for educational materials. The presence of numerous Shopify-hosted PDF links, while many are benign, contributes to a link farm tactic.

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/pify?keyword=myers+ap+psychology+test+bank+pdf
    • http://files.finleydesignart.com/uploads/1/3/0/9/130969981/1880772.pdf
    • http://files.thebeautybarracuda.com/uploads/1/3/1/0/131070611/jufumavufuk.pdf
    • http://jamatuzar.davebundtzen.com/uploads/1/3/1/3/131383744/gijufulitopiviruvila.pdf
    • http://files.kramerjewelers.com/uploads/1/3/0/7/130776399/524483.pdf
    • http://files.wisconsinstringquartet.com/uploads/1/3/2/6/132681665/mutomuxakusigutugova.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6774/files/82345492291.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/plano_metro_barcelona_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/7715/7542/files/67113208503.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/nojarezibujo.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/17445765860.pdf
    • https://cdn.shopify.com/s/files/1/0448/1702/3138/files/search_engine_optimization_all_in_one_for_dummies_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/6392/7206/files/php_header_utf_8.pdf
    • https://cdn.shopify.com/s/files/1/0428/9177/2063/files/bavegava.pdf
    • https://cdn.shopify.com/s/files/1/0435/4709/9290/files/business_newspaper.pdf
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/13743174344.pdf
    • https://cdn.shopify.com/s/files/1/0450/2441/1806/files/zawiriju.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_off0000462e.bin
820c4b62cacbc3b280a4c3e965b4c79deceec36c65db7bb0168d2eb7976224d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x462E 5468 bytes
font_01_sfnt_off000058c3.bin
a7d24051c72d3170f7e28340d5cd48370241c8f32fc712c45d3753922e89d418		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58C3 9912 bytes
font_02_sfnt_off00007a62.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A62 4324 bytes

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