Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a81debc853ba8b…

MALICIOUS

PDF

33.3 KB Created: 2020-08-22 08:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbb22da1a887e1f60fbbfe0fe857f4b9 SHA-1: dfd08406b231c87ccdb62036d24734ac221e5632 SHA-256: c2a81debc853ba8b8de8c9073b0ba5b9b3feec5b3e3635273370f67388267f53
150 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains a critical heuristic indicating it's a malicious redirector. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files. One of these URLs, 'https://ttraff.ru/pify?keyword=ben+10+ultimate+alien+games++ppsspp', is identified as a known malicious redirector. The document body contains garbled text but also includes the same URLs found in the heuristics, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=ben+10+ultimate+alien+games++ppsspp
    • http://files.vachorale.org/uploads/1/3/0/7/130776255/verozesufunaderomoga.pdf
    • http://files.hugobenedetti.com/uploads/1/3/0/7/130738562/todorugowisinexug.pdf
    • http://mugelip.sunshinemanagementmoraira.com/uploads/1/3/1/3/131398140/xogizakigef.pdf
    • https://cdn.shopify.com/s/files/1/0430/7763/2161/files/diagnostico_ambiental_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0435/5080/2081/files/55164201235.pdf
    • https://cdn.shopify.com/s/files/1/0434/3159/2092/files/mysql_copy_table.pdf
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/komugaguwixuraz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/66381222179.pdf
    • https://cdn.shopify.com/s/files/1/0437/1687/0309/files/muxapemijiredu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/how_to_scrub_infor_from_website_php.pdf
    • https://cdn.shopify.com/s/files/1/0440/6244/1637/files/godorajozog.pdf
    • https://cdn.shopify.com/s/files/1/0439/4424/7451/files/megemi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/6920067011.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_off00004725.bin
99a918eb0edc9b0ef17bf92f72f7723ad29505a2b9b3d5af09a432981f062770		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4725 5288 bytes
font_01_sfnt_off00005919.bin
f7045280afbe1f2f49c3bcd9cf625ea9c3fdd5f5ba5c6dd8041120f4d9e76f5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5919 9184 bytes

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