Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd187c1a4d4a518…

MALICIOUS

PDF

49.6 KB Created: 2020-08-08 19:39:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5759bfc1c1c64b19a3b40a5538d043b SHA-1: fd7589250634f033a4d953abb78b2adce01b09d1 SHA-256: ccd187c1a4d4a518496ee0a3e95c1c94582425747594d1940852203ef7d642cf
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure via the URL https://ttraff.cc/pify?keyword=pulmonary+arterial+hypertension+pathophysiology+pdf. This suggests the document is designed to lure users into clicking malicious links, likely leading to further compromise.

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=pulmonary+arterial+hypertension+pathophysiology+pdf
    • http://files.mindfulmethow.com/uploads/1/3/0/8/130813851/9797365.pdf
    • http://files.jakemater.com/uploads/1/3/1/6/131636819/bosalumozen.pdf
    • http://kopami.davidawestbrook.com/uploads/1/3/2/6/132681352/5605257.pdf
    • http://files.seattlefirstbaptist.org/uploads/1/3/2/3/132303080/81e42db7c9176.pdf
    • http://files.britishcolumbiaschoolactsection177.ca/uploads/1/3/1/0/131071164/47c5a1fc2a.pdf
    • https://cdn.shopify.com/s/files/1/0434/6567/0806/files/71762309625.pdf
    • https://cdn.shopify.com/s/files/1/0432/0113/4747/files/44967793197.pdf
    • https://cdn.shopify.com/s/files/1/0435/2383/4011/files/spark_lazy_evaluation.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7522/files/greek_mythology_gods_and_goddesses_stories.pdf
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/nuparudenaluxapibulebow.pdf
    • https://cdn.shopify.com/s/files/1/0434/8474/1798/files/sabiti.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/50279659079.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/6707615604.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/xuvozidirisokavu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fiwowosilikaragufes.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/66791833649.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/somafejupifige.pdf
    • https://cdn.shopify.com/s/files/1/0434/3208/3612/files/jonofote.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_off000083e8.bin
d22c13bb25e9400c7f3a3505d6a528c7d84781d1c570c9c7b3e474a6c81ad0be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E8 5556 bytes
font_01_sfnt_off000096a8.bin
b8eeb218f127008a8df12d77bdc5df9adb3a095a206772d4ac8fc95e82a93131		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96A8 10020 bytes

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