Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcf786d43913e56…

MALICIOUS

PDF

62.6 KB Created: 2020-08-25 17:39:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eeccee89952608defbef1a1b2c7f529f SHA-1: 909edb5055526656b85f13249ddddb347e009cd4 SHA-256: 7bcf786d43913e5677239154ae0cef9d3af888d57ecd850a6ca89c93c170acfe
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.com. The document body, though obfuscated, includes the academic-sounding title 'Information bottleneck theory of deep neural networks' and the malicious URL, suggesting a lure to a phishing or malware distribution site. No scripts were extracted, and the primary malicious activity observed is the redirection via embedded links.

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=information+bottleneck+theory+of+deep+neural+networks
    • http://files.houseofnonie.com/uploads/1/3/0/9/130969446/nabagixug.pdf
    • http://puwaxud.malaykaneith.com/uploads/1/3/0/8/130814328/73247e1.pdf
    • http://linesawe.freechristianebooks.org/uploads/1/3/1/3/131398360/navawotiliwas_zimitulemoxu_mudinaribazupe_logev.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/62149840029.pdf
    • https://cdn.shopify.com/s/files/1/0433/6015/7855/files/lejavanefaluke.pdf
    • https://cdn.shopify.com/s/files/1/0430/6580/2905/files/46026143222.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4051/files/xodidatelizukat.pdf
    • https://cdn.shopify.com/s/files/1/0428/8443/2031/files/97849020958.pdf
    • https://cdn.shopify.com/s/files/1/0433/3817/0526/files/ford_2000_tractor_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/5752760376.pdf
    • https://cdn.shopify.com/s/files/1/0430/5528/4378/files/tovutimifurikes.pdf
    • https://cdn.shopify.com/s/files/1/0430/3496/8213/files/28977502745.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/git_drop_changes.pdf
    • https://cdn.shopify.com/s/files/1/0428/5222/1091/files/77972192285.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/jaruwuxasom.pdf
    • https://cdn.shopify.com/s/files/1/0435/7701/6483/files/xobitanukedonekufelul.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_off000092cd.bin
e24028070ea18ffb51ec99c8be09ed468280f4f17a162df6b908e4ef28969799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92CD 5732 bytes
font_01_sfnt_off0000a625.bin
7b7478eb06a54cd00f77a6ff2a93db1a6df177c60cfe28d231953766be2fe519		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA625 15808 bytes
font_02_sfnt_off0000d80b.bin
9c057ac09ec7e90559246466cf17d5e2b4b033cefee822b4d3dac6bf26bbb550		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 16088 bytes

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