Malicious PDF — malware analysis report

Static analysis result for SHA-256 173ffc0345a0b2ab…

MALICIOUS

PDF

48.4 KB Created: 2020-07-22 00:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0658cf448179229c571549a25efd32d5 SHA-1: ace92781c7fc0c8f6ee3146594007a7d42c0beec SHA-256: 173ffc0345a0b2ab645d297a11d9d9f3f1b145603adf047797dc9fb911dfb180
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.cc/wb?keyword=premature%20ejaculation%20treatment%20pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, appears to be related to the lure text. The ML classifier strongly flagged this PDF as malicious.

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.cc/wb?keyword=premature%20ejaculation%20treatment%20pdf
    • http://files.icense.org/uploads/1/3/0/7/130740090/7994065.pdf
    • http://files.dunbriste.com/uploads/1/3/2/6/132695805/755e15907f.pdf
    • http://files.edhgs.com/uploads/1/3/1/4/131408529/lujaremokike_nezuki_derunelizaxeti_kelabij.pdf
    • http://files.mik9ac.com/uploads/1/3/0/7/130775071/nalomafavasorode.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0983/3117/files/fowimedebuxiru.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/17769310166.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/48299011157.pdf
    • https://varotedip.files.wordpress.com/2020/06/17059086343.pdf
    • https://jixemokubuxu.files.wordpress.com/2020/06/muwoxibopeju.pdf
    • https://vowonagu.files.wordpress.com/2020/07/14325362943.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/97516274754.pdf
    • https://cdn.shopify.com/s/files/1/0433/8958/3514/files/beman.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/52498307581.pdf
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/74395465986.pdf
    • https://cdn.shopify.com/s/files/1/0431/1652/7770/files/lidirepidixewepajaze.pdf
    • https://cdn.shopify.com/s/files/1/0431/5676/6882/files/baporiwutugixiboxej.pdf
    • https://cdn.shopify.com/s/files/1/0430/8008/9760/files/tarip.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7265/files/16580113673.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/4683366459.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008092.bin
7e26068749e739d61fdf2ca80a2c4ae6816f70bda9ea23c63a71dcd1acc7d303		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8092 5084 bytes
font_01_sfnt_off000091b9.bin
f32f1ccb9cb16ffe92514b97cb68aae727951d55a0c86900dce627f6156c8490		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91B9 10084 bytes

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