Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3a83660a2a0923…

MALICIOUS

PDF

49.5 KB Created: 2020-08-22 06:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb1f04d13381d4e150a9b873a65a8525 SHA-1: 0cbf7c8d121eeeabd05bc797d1de1a1e7ee69150 SHA-256: 4a3a83660a2a0923e371086a171b264fecaf0b8aa22d9ab4b55d48a3800de2fd
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains numerous embedded links. One of these links, 'https://ttraff.ru/pify?keyword=cat+eye+bike+light+manual', points to known malicious redirector infrastructure. The document also exhibits characteristics of a PDF link farm, with many links pointing to external PDF files, suggesting a potential attempt to manipulate search engine rankings or distribute further 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.ru/pify?keyword=cat+eye+bike+light+manual
    • http://debobi.prideandjoymonogram.com/uploads/1/3/0/8/130814328/3fb41ce.pdf
    • http://xunab.teaandtango.com/uploads/1/3/2/7/132740214/xozezubopezobej.pdf
    • http://likiwesow.naildbykk.com/uploads/1/3/0/9/130969407/8927957.pdf
    • https://cdn.shopify.com/s/files/1/0433/7506/7297/files/wheel_of_life_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fatexuxutul.pdf
    • https://cdn.shopify.com/s/files/1/0432/4353/6552/files/12486406891.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/passi_affrettati.pdf
    • https://cdn.shopify.com/s/files/1/0432/7935/1976/files/kugafejulanemaverojufafa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9445/0082/files/complete_guitar_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9121/files/romelogagu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8312/9251/files/zenupe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/99588638958.pdf
    • https://cdn.shopify.com/s/files/1/0434/7923/6760/files/mukogasomiwalusija.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_off000079ea.bin
ad4918e8faf47945c9dbeaf4258a474dca7a9e65a6634e7d98f045c57885e45a
pdf-font-stream PDF embedded font (sfnt) at offset 0x79EA 5036 bytes
font_01_sfnt_off00008afd.bin
109a9f95a3bf9b4fa3c610487fe407903a1b14d963d8d5299edf9d063d3b32ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFD 14896 bytes