Malicious PDF — malware analysis report

Static analysis result for SHA-256 463ccefd3170363f…

MALICIOUS

PDF

48.8 KB Created: 2020-08-30 03:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5ed274b6d3dffb7b035a68d35b669fd SHA-1: f39416075edd6708dab1a755219d2a0a404cf186 SHA-256: 463ccefd3170363fa39dff4b054854879c64a10dca791f8c25557e90bce67a9e
154 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a 'Cambridge business english dictionary pdf' and includes the malicious URL. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to distribute the malicious PDF.

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/wix?keyword=cambridge+business+english+dictionary+pdf
    • https://cdn.shopify.com/s/files/1/0432/7256/8996/files/ktm_50_aftermarket_parts.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0135/files/58185221086.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/75618776459.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8019/files/automatic_transmission_system_in_cars.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5833/files/jolofugunuvixematopa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/romantic_cartoon_images.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6070/files/68549337774.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3813/files/vasixun.pdf
    • https://static.usrfiles.com/ugd/b8c837_01f2fd2444b2434586ba0b0969919ead.pdf
    • https://static.usrfiles.com/ugd/b8c837_06d5455927bf4d52b7ed8068d98a2e3c.pdf
    • https://static.usrfiles.com/ugd/40b9e6_51315f0d8d7e4bd28e907a8214118bc2.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9079/files/44445211534.pdf
    • https://cdn.shopify.com/s/files/1/0438/7844/9307/files/ability_score_generator.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8482/files/26464641206.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/xumudali.pdf
    • https://cdn.shopify.com/s/files/1/0433/7601/7559/files/kakuro_number_combinations.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_off00007fc9.bin
0e7b0d82dd19d6006cb466302ba23a268fb899f88b5334d398af770edb21c76a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC9 5716 bytes
font_01_sfnt_off0000930e.bin
6a1712935ed88cead312e3dff3f9174e31ff9ae7e1170f1f357654db02d3b0a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x930E 10416 bytes

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