Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b96f01fdaffceb4…

MALICIOUS

PDF

50.4 KB Created: 2020-08-13 18:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6ec9f5eb022828abc6432d00bfa8d9c SHA-1: 1c9cd93737234117e37859732296022f6f882570 SHA-256: 8b96f01fdaffceb44bf51330a9ec3ba54e0b4781ca53e2aad5b4b80a11e50a27
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wb?keyword=class%20diagram%20in%20dbms%20pdf'. Additionally, it exhibits a PDF link farm heuristic, with numerous links to Shopify domains, one of which is 'https://cdn.shopify.com/s/files/1/0431/0519/0041/files/blender_tutorial_full.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to a phishing or malware distribution site.

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/wb?keyword=class%20diagram%20in%20dbms%20pdf
    • http://files.martin-watzinger.com/uploads/1/3/1/4/131437233/694bc50c20e19.pdf
    • http://files.ims-spi.com/uploads/1/3/1/3/131398143/b3b789f78112.pdf
    • http://files.hwgirlsbasketball.com/uploads/1/3/1/3/131384436/791e84b5c1212d.pdf
    • http://files.barringtonih.com/uploads/1/3/1/4/131407369/8803435.pdf
    • https://cdn.shopify.com/s/files/1/0431/0519/0041/files/blender_tutorial_full.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/14162226595.pdf
    • https://cdn.shopify.com/s/files/1/0429/1185/8855/files/allen_test_papers_2020_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/72647355548.pdf
    • https://cdn.shopify.com/s/files/1/0434/5076/1377/files/xemaletizunirulazo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2979/8818/files/zogugiluzezamirimovukis.pdf
    • https://cdn.shopify.com/s/files/1/0434/3637/6231/files/9362755957.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lekerumukin.pdf
    • https://cdn.shopify.com/s/files/1/0432/9914/3838/files/42970741816.pdf
    • https://cdn.shopify.com/s/files/1/0434/4361/7948/files/biology_eoc_review_packet.pdf
    • https://cdn.shopify.com/s/files/1/0433/4357/7256/files/pin_and_avalanche_photodiode.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/
    • https://cdn.shopify.com/s/files/1/0434/5076/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fa1.bin
e921b52c75ce0afd87ca7e5953033c74be5c82acbcaf90e7a0fcb8ed68466629		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA1 5404 bytes
font_01_sfnt_off000081dc.bin
3fb689387a1a591e9ce4d2e795b517785eba86ed0352ab0b20278bfc8bee5615		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81DC 10816 bytes
font_02_sfnt_off0000a72e.bin
98591f62b8fab4a4c85aa030140afd8a77efa95101a51dfb8a6f790f5e97f598		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA72E 16076 bytes

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