Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad62c0315a62479…

MALICIOUS

PDF

62.7 KB Created: 2020-08-20 01:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 374ee8adbb5014ad3f1f4c43bc4c8f68 SHA-1: 12ffea35f55757c0847bef0fb2e0b6bcafb2e5a4 SHA-256: 8ad62c0315a624796f219eb361b1eefb5e75dd4b57372d45666226085f0b49d1
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The embedded URL 'https://ttraff.com/pify?keyword=aligarh+muslim+university+history+pdf' is a primary indicator of this malicious intent. The document body, though heavily obfuscated, contains this URL, reinforcing the finding. The presence of numerous external PDF links, many hosted on cdn.shopify.com, suggests a tactic to obscure the final malicious destination and potentially leverage benign-looking domains for distribution.

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=aligarh+muslim+university+history+pdf
    • http://files.michaelhogarth.com/uploads/1/3/1/1/131163667/2327735.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/daworobatav.pdf
    • https://cdn.shopify.com/s/files/1/0437/8837/0077/files/33920170704.pdf
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/army_da_4856.pdf
    • https://cdn.shopify.com/s/files/1/0463/2389/2381/files/depoxetinawimararer.pdf
    • https://cdn.shopify.com/s/files/1/0434/8231/6957/files/begrijpend_lezen_groep_4_werkbladen.pdf
    • https://cdn.shopify.com/s/files/1/0436/3111/6448/files/koxabiwoxuj.pdf
    • https://cdn.shopify.com/s/files/1/0440/5267/6773/files/maradawexevog.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/geberaloriregap.pdf
    • https://cdn.shopify.com/s/files/1/0449/9403/5880/files/business_formal_vs_cocktail_attire.pdf
    • https://cdn.shopify.com/s/files/1/0436/8446/2745/files/words_instead_of_said_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/1073/4755/files/radicalism_in_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/20203120302.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_off0000a114.bin
71d28002ef67f81a6543b0e3aad9a897dbbd27e675f8c1e0f4d5a5154d4dd555		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA114 5608 bytes
font_01_sfnt_off0000b414.bin
d28a81a871f0e9b68745a3ed4a41a68495a711519aa4cce3e1d5876f950bc6d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB414 10508 bytes
font_02_sfnt_off0000d852.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 16164 bytes

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