Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c889cc78c15302…

MALICIOUS

PDF

47.4 KB Created: 2020-08-22 06:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14e517b9e6870ca985ad6ad552b3d6b2 SHA-1: 29666dd686c1818d796d1326a85564bb866d7f32 SHA-256: 16c889cc78c1530209168ab537a2ffcc52acc641be3380882d6cd4d9e087c82d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO abuse. The document body, though heavily obfuscated, contains the malicious URL.

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=bg+voz+informacije+kontakt
    • http://files.elizabethkilcoyne.net/uploads/1/3/2/7/132740250/vofaxatiruda.pdf
    • http://files.skylikesnow.com/uploads/1/3/0/7/130738619/848ad9654adb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/baby_shower_invitations_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/7770705636.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/53525739073.pdf
    • https://cdn.shopify.com/s/files/1/0433/9934/8389/files/vajatolapur.pdf
    • https://cdn.shopify.com/s/files/1/0433/2067/2409/files/nobadobovij.pdf
    • https://cdn.shopify.com/s/files/1/0435/5765/0584/files/96077157232.pdf
    • https://cdn.shopify.com/s/files/1/0430/6190/3517/files/48706339290.pdf
    • https://cdn.shopify.com/s/files/1/0435/2707/8052/files/inductive_approach_in_teaching_grammar.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_off000070b3.bin
f4d1abdd3aa35f5b837c2089596c8978b263921618c2ee6eab89c60fb84ce563		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B3 5292 bytes
font_01_sfnt_off000082b6.bin
c6dd559681903a8360ae97e7d5a0673365be697480d139e6489efcd9527b502f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B6 15136 bytes

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