Malicious PDF — malware analysis report

Static analysis result for SHA-256 333aa569b11c063d…

MALICIOUS

PDF

56.2 KB Created: 2020-08-10 07:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16117a878d051ae06ff34db5edaec249 SHA-1: d4160ba7861717df45f9a0fedb1f143da8c53e17 SHA-256: 333aa569b11c063dd2ced0dc9583fdb52941d7a18a75ce930dc001466968ebc0
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, indicative of a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=ayatul+kursi+shia+pdf. The document body contains obfuscated text and references to wkhtmltopdf, suggesting it was programmatically generated. The presence of numerous Shopify URLs, some confirmed benign, alongside the malicious redirector, points to a strategy of using legitimate platforms to host or link to potentially harmful 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=ayatul+kursi+shia+pdf
    • http://files.saltlakefencecompany.com/uploads/1/3/0/7/130775242/xavufujigumefoz_kimawemubikova.pdf
    • http://files.piratessoftballclubwa.com/uploads/1/3/1/4/131453076/xuvarebov.pdf
    • http://files.coverallbases.org/uploads/1/3/0/7/130740138/22778.pdf
    • https://cdn.shopify.com/s/files/1/0439/7950/5822/files/12th_science_biology_book_in_gujarati_sem_3_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/6488/3355/files/11192054705.pdf
    • https://cdn.shopify.com/s/files/1/0431/5673/4109/files/datogiliku.pdf
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/26741280499.pdf
    • https://cdn.shopify.com/s/files/1/0433/9970/8821/files/8011238126.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8423/files/61148037105.pdf
    • https://cdn.shopify.com/s/files/1/0431/5388/3293/files/21730587076.pdf
    • https://cdn.shopify.com/s/files/1/0432/3537/7307/files/jexoneribedakete.pdf
    • https://cdn.shopify.com/s/files/1/0437/5950/1464/files/how_to_download_file_from_github.pdf
    • https://cdn.shopify.com/s/files/1/0444/3108/1639/files/java_script_go_back.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/44530516992.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
stream_005_off0000a0eb.bin
48e515ed163b859b735aae97797f88e0c663adf0d91b96464867703fe4c9cdb7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA0EB 28060 bytes
font_00_sfnt_off00006a0f.bin
52c98b386d5d3292cba0a465016db3ce22ab524d8aca5b034cf027614ef20929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0F 5284 bytes
font_01_sfnt_off00007c11.bin
9fc3f081751ad329454b74b2bc28dc0637a67e686755058dbb992c9f8d60c3ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C11 11136 bytes

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