Malicious PDF — malware analysis report

Static analysis result for SHA-256 635383e46dc8a61f…

MALICIOUS

PDF

44.1 KB Created: 2020-07-30 20:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 845fa86d151afb1b2640280c31261487 SHA-1: 3378148dd065a5511dabb367c48f1ef7401280cb SHA-256: 635383e46dc8a61ff08285e9f506792da5a348b27b573d04ff904084197b3075
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm and one specifically to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to technical documents. The presence of embedded URLs and the link farm heuristic suggest an attempt to drive traffic to malicious sites, potentially for phishing or malware distribution.

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=axial+flow+compressor+solved+problems+pdf
    • http://files.edgemotorsportsrva.com/uploads/1/3/0/7/130738596/3344290.pdf
    • http://files.monicafrdunne.com/uploads/1/3/1/4/131407047/vikexumifutujol-solilegotu-jenuxas.pdf
    • http://files.b12beyou.com/uploads/1/3/1/4/131437886/fizujubik-xodas-vubuvusoz-gujodujaziga.pdf
    • http://files.bayfieldpresbyterian.com/uploads/1/3/1/4/131482991/xodifexekilob_sibidetisina_pikumozi_vokosak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0493/5835/files/fuxazunugogoxuwesosu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/83049703912.pdf
    • https://cdn.shopify.com/s/files/1/0436/3550/7358/files/zumujekupeveveze.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/94562449812.pdf
    • https://cdn.shopify.com/s/files/1/0440/2115/3957/files/70727943831.pdf
    • https://cdn.shopify.com/s/files/1/0431/3559/8758/files/5300997454.pdf
    • https://cdn.shopify.com/s/files/1/0433/4170/9462/files/18042998913.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/72052716400.pdf
    • https://cdn.shopify.com/s/files/1/0436/7712/2713/files/lenova.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/repijivaxuvebusisipig.pdf
    • https://cdn.shopify.com/s/files/1/0437/7598/3778/files/37344480321.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/tolabigepikuniga.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_off00006eb6.bin
464a5f1cac330921bc5a338f9de85870d63719b235251a5e0063b1c2ddb9bafd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB6 5252 bytes
font_01_sfnt_off000080a4.bin
e67e854237354118578dcd2bdebeeebeea9cd68488f931a68d97811fe8ea517f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A4 10060 bytes

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