Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad436a0e589da040…

MALICIOUS

PDF

35.0 KB Created: 2020-08-21 04:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6d69938b3afce17898384b9ae8a7263 SHA-1: 2f5de0cf0ed155a515a931efa31f43e14c47feb8 SHA-256: ad436a0e589da040ea8f50a6fcdf6bac8f659cc3abd303d0374135b758ebc40e
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 of which point to a redirector service (ttraff.com) known for malicious activity. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the link farm and the redirector URL are strong indicators of a phishing or redirection attack.

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.com/pify?keyword=the+octonauts+creature+report
    • http://depipal.joshuajayindo.com/uploads/1/3/0/9/130968921/sipewe.pdf
    • http://files.nebraskansunitedforthegoodlife.net/uploads/1/3/0/7/130776409/tikivog-gazevi.pdf
    • http://files.moonrosesoap.com/uploads/1/3/1/3/131398204/rukopan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jujirufevob.pdf
    • https://cdn.shopify.com/s/files/1/0432/1532/3291/files/types_of_amnesia.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/9076033457.pdf
    • https://cdn.shopify.com/s/files/1/0436/0408/2851/files/bironusuzok.pdf
    • https://cdn.shopify.com/s/files/1/0428/5674/3079/files/zinefenekisemepi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/xadatikemi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2807/9004/files/30708651791.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/the_idle_class_game.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7614883084.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/assurance_engagement.pdf
    • https://cdn.shopify.com/s/files/1/0438/5269/3654/files/91396065652.pdf
    • https://cdn.shopify.com/s/files/1/0436/6503/1321/files/amar_asom_newspaper_today.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8333/files/82582789766.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_off00004cd2.bin
b687818fe2c4cca6daa316dbce3f71ea039724d9205ccc6b3c503071bfd1e078
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD2 4940 bytes
font_01_sfnt_off00005d8f.bin
c62c730f6765c039eb2fa585af9a654220c5e159526d65b03341e4b2c669eb79
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8F 9856 bytes