Malicious PDF — malware analysis report

Static analysis result for SHA-256 a772c3a646c5f561…

MALICIOUS

PDF

48.8 KB Created: 2020-08-03 23:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 154288cc06f1b8ca946fc2f1d06c4a2a SHA-1: 28c8c8168f894c5bc05d6ab0f43b97140fd50ff7 SHA-256: a772c3a646c5f5612971286660db32896fde3f5a93dc593e4a4f03859b49aa7c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'administrative law reviewer pdf' and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to improve search engine ranking for malicious content.

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/pify?keyword=administrative+law+reviewer+pdf
    • http://tusova.coastalwomensshelter.org/uploads/1/3/2/8/132815028/1b5cdc3588fd38.pdf
    • http://files.greenvalleyroastingcompany.com/uploads/1/3/2/6/132681479/49963a61f19fb1.pdf
    • http://files.trafletfabian.com/uploads/1/3/0/9/130969356/xolitusonatimafo.pdf
    • http://files.lvcoptical.com/uploads/1/3/0/7/130739039/96ea4799.pdf
    • https://cdn.shopify.com/s/files/1/0429/2483/4975/files/guzegedefosomizojoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/3171/5225/files/zabuju.pdf
    • https://cdn.shopify.com/s/files/1/0436/1784/5411/files/jetta1_8_turbo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8080/1701/files/ninadasesekudifewaliw.pdf
    • https://cdn.shopify.com/s/files/1/0428/5438/3782/files/tobulexix.pdf
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/7820277427.pdf
    • https://cdn.shopify.com/s/files/1/0430/5459/6250/files/dobusalulirumepuravab.pdf
    • https://cdn.shopify.com/s/files/1/0433/5511/1589/files/fojerosonofizojomatavajin.pdf
    • https://cdn.shopify.com/s/files/1/0433/3076/4968/files/57604491368.pdf
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/62307579742.pdf
    • https://cdn.shopify.com/s/files/1/0434/6052/6246/files/zafipatewugujuwidusir.pdf
    • https://cdn.shopify.com/s/files/1/0434/1638/7733/files/vanafusuribum.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/67494830132.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_off00008228.bin
dc1525d5b8b588ae247db8b23f54ff4864c0a40a05ff24fcd79aa7c52b3be9b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8228 5328 bytes
font_01_sfnt_off00009440.bin
b5c80efe71dcba11f7aae5ffc9b63890f1d75f5a7c27c4b2e1e0458265675a80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9440 9976 bytes

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