Malicious PDF — malware analysis report

Static analysis result for SHA-256 d244881605ce0ebb…

MALICIOUS

PDF

43.8 KB Created: 2020-08-20 07:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d06cf348e195f58752002d168e117b18 SHA-1: 8d9943a6d647c082dcaba73ae6472b7f25f018eb SHA-256: d244881605ce0ebb9098c8005d387ca33bda698d5aee7a3c4e74afbda238c68c
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to potentially malicious redirectors or link farms. The document body, though partially corrupted, includes text related to sales performance and the URL 'https://ttraff.ru/pify?keyword=alta+performance+em+vendas+senac', suggesting a lure to a malicious site. The ML classifier strongly indicated maliciousness.

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=alta+performance+em+vendas+senac
    • http://kijejonus.overtonjctms.com/uploads/1/3/2/6/132682076/e38825545b260.pdf
    • http://files.fireguardms.com/uploads/1/3/1/4/131438071/8762181.pdf
    • https://cdn.shopify.com/s/files/1/0439/4683/6123/files/wibavakawatunesovutabej.pdf
    • https://cdn.shopify.com/s/files/1/0433/8660/1635/files/egyptian_colloquial_arabic_verbs.pdf
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/19707564103.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/guwoxevumojovadanagekazuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/5320/3104/files/wafabuvopevifajuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/2282/8198/files/4189618339.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2279/files/52730830949.pdf
    • https://cdn.shopify.com/s/files/1/0437/9030/3381/files/beaufort_wind_scale.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/thermal_and_automobile_engineering_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/32439007671.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c3f.bin
967f2e26c3c18eb4494e344ff632ffa6cae177e4b41e3546b762bd4996f6a1dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3F 5088 bytes
font_01_sfnt_off00006d72.bin
8f26fbf5e0def59b92f01d3b46082b5c7a45f8f9ad58fc374fa8ac11fa0b3581
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D72 12356 bytes
font_02_sfnt_off000092c3.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x92C3 4324 bytes