Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15a258e378b2357…

MALICIOUS

PDF

40.0 KB Created: 2020-07-10 00:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f95a1ebc0525db5233282f961ffdec41 SHA-1: e5252a178b50050f7153e96b4159f26d70b68e28 SHA-256: f15a258e378b2357e12cc6ffe1d349cb941c628d81e67399fe04b04bc0338234
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, indicating a link farm or SEO manipulation strategy to distribute malicious content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a redirector URL, and PDF_SEO_LINK_FARM highlights the mass external link structure. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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.ru/wb?keyword=activity%20series%20pdf
    • http://files.hhsarthistory.com/uploads/1/3/1/4/131482808/dafukisa.pdf
    • http://files.villagesatlynxcreek.com/uploads/1/3/1/3/131378816/5f3ccf81c.pdf
    • http://files.rta-ot.com/uploads/1/3/1/0/131070895/8522646.pdf
    • http://files.kaimodeling.info/uploads/1/3/1/1/131163723/2097084.pdf
    • http://files.starmembership.org/uploads/1/3/0/8/130814120/wemolewuziko_vijifaro.pdf
    • http://files.fhcamd.org/uploads/1/3/1/6/131637034/5932877.pdf
    • http://files.jamesmatthewwilson.com/uploads/1/3/1/6/131637057/d1e23bb.pdf
    • http://files.marriedmarks.com/uploads/1/3/2/8/132816158/wawezanuz-titun-resuta-ponupax.pdf
    • https://mukeninesev.files.wordpress.com/2020/06/79510055737.pdf
    • https://jeluzonodifi.files.wordpress.com/2020/07/wodotumogapez.pdf
    • https://kadawajoxezo.files.wordpress.com/2020/06/jupijaxemalo.pdf
    • https://tapuxagad.files.wordpress.com/2020/07/31615438393.pdf
    • https://nomutodiri.files.wordpress.com/2020/06/27292881347.pdf
    • https://nudokux.files.wordpress.com/2020/06/venelavutapidofepomenav.pdf
    • https://mijukuwojaw.files.wordpress.com/2020/06/gumuposum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lavijado.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kubogofire.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/14981909947.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56346524494.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xubeke.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mojedisubeweful.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_off000061a7.bin
654911ffcd79efd9cf74a09f699dc244380c7a7fd0a7bb0baf7eb88b434904ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A7 4632 bytes
font_01_sfnt_off00007184.bin
e9c229d3353a5f3a3c9a538b3a814ca33feae3d28fd3bbea92197b23c56a4032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7184 9964 bytes

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