Malicious PDF — malware analysis report

Static analysis result for SHA-256 149b67c367e131f9…

MALICIOUS

PDF

45.8 KB Created: 2020-08-04 02:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 027402c579dd5d462280350e2b00667c SHA-1: e019f931ea36a309629cbcca6864cf058a697f09 SHA-256: 149b67c367e131f9a503d83add139fdc997cfa223edddc198ad74341882e4b62
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO manipulation scheme, aiming to redirect users to malicious sites.

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/pify?keyword=comparison+of+adjectives+examples+pdf
    • http://files.gypsygeorge.com/uploads/1/3/0/9/130969340/tawejakomigedapiziz.pdf
    • http://files.westernleatherhq.com/uploads/1/3/2/7/132741198/7507197.pdf
    • http://files.nakaishatolbertbanks.com/uploads/1/3/2/7/132711947/4d11afa.pdf
    • http://files.rjgossage.com/uploads/1/3/0/7/130739309/7b010.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2462/1473/files/70632593282.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/45857377889.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8330/files/94216259696.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/purubed.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/45469718763.pdf
    • https://cdn.shopify.com/s/files/1/0429/3361/6803/files/arthashastra_in_kannada_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/ronuzanazofuvatuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/perabeboxetiruwef.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0398/files/reluvepisasawode.pdf
    • https://cdn.shopify.com/s/files/1/0434/6501/5446/files/pedefidoxaju.pdf
    • https://cdn.shopify.com/s/files/1/0437/2670/0696/files/bivavibakalesu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/writing_a_fractured_fairy_tale_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067aa.bin
c611e86245cb5074eed21c5b5603b3efeb544448c6f8474b30b257d68f76da81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AA 5316 bytes
font_01_sfnt_off000079ac.bin
88f01fbe81bb479c6b74367dfec8caaeb3abb4f62f75caeb4a3b57f3278297c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79AC 10060 bytes
font_02_sfnt_off00009c1b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C1B 4324 bytes

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