Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08cdf0cd0bdd227…

MALICIOUS

PDF

51.0 KB Created: 2020-08-14 02:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca6bef98038a0d235a83d15f9f2565d5 SHA-1: c90c573c6989ffef1a2f8cd4ff6fdd148fc14404 SHA-256: b08cdf0cd0bdd2271b985f4922701864af32a8b298b95b36bece1f80c88926a2
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector (ttraff.ru). The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content. The presence of numerous other links, many pointing to Shopify domains, indicates a potential SEO spam or link farm strategy to distribute 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=android+app+development+tutorial+free
    • http://files.itsawonderfullifestyle.com/uploads/1/3/2/6/132681634/dexutonowutofi-pebovenurajepib.pdf
    • http://diruzi.tanithfrost.com/uploads/1/3/2/7/132740720/kulosus_xafamukezax_xamazikofeg.pdf
    • http://files.curiositycabinet.org/uploads/1/3/0/8/130873810/2436995.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/bosch_filter_cross_reference.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/valedictorian_speech_ideas.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/89964308887.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/topedit.pdf
    • https://cdn.shopify.com/s/files/1/0429/6946/4991/files/41713974165.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/kosevukijapawof.pdf
    • https://cdn.shopify.com/s/files/1/0435/5263/7091/files/kenmore_elite_refrigerator_not_cooling.pdf
    • https://cdn.shopify.com/s/files/1/0434/0976/8600/files/jugefefos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9308/2783/files/lawolafetunudu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kenawuvotijogajutimev.pdf
    • https://cdn.shopify.com/s/files/1/0434/3509/8264/files/camera_scan_to_apk.pdf
    • https://cdn.shopify.com/s/files/1/0439/2216/1832/files/convert_to_word_document_i_love.pdf
    • https://cdn.shopify.com/s/files/1/0431/4782/1212/files/zimsec_a_level_computer_science_syllabus.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_off0000896f.bin
a82f5ae390ed81e734b370e454d0630de99932031a711e0f0f12f1d79fe2b8e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x896F 5060 bytes
font_01_sfnt_off00009a96.bin
09f9f61c677249be58dc863f94b57ed5dd34a1f573b25b90b6f829b4955b4a12
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A96 10744 bytes