Malicious PDF — malware analysis report

Static analysis result for SHA-256 43036a9f9e9fa161…

MALICIOUS

PDF

44.8 KB Created: 2020-07-31 22:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23701263ccb4a11e7e1694aff826359e SHA-1: 3aa433607a1b008baf56f799a42e6cce48d5089a SHA-256: 43036a9f9e9fa1611b2c9f121268b8d03ba4fc53a3fbda42ae05ca70f2edfa3a
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content. 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/pify?keyword=fire+emblem+gba+walkthrough
    • http://files.foundationstc.com/uploads/1/3/1/4/131407708/3526253.pdf
    • http://files.habitathawaiiisland.org/uploads/1/3/1/3/131398242/firapexowege-bewebesibi-bokidunof.pdf
    • http://files.pachydermmagazine.org/uploads/1/3/1/4/131438228/017f4e9.pdf
    • http://files.treeaidinc.com/uploads/1/3/1/4/131454221/9dfa0b4.pdf
    • http://files.mikelahenrylowe.com/uploads/1/3/1/4/131438059/2426281.pdf
    • https://cdn.shopify.com/s/files/1/0430/9129/6413/files/kalagamabiganalopekuxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5861/6733/files/zigaduzibulojaju.pdf
    • https://cdn.shopify.com/s/files/1/0437/7051/1521/files/zakij.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/pafapemop.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6178/files/gonozisobilutula.pdf
    • https://cdn.shopify.com/s/files/1/0432/0120/0289/files/jubatu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4112/0679/files/rojeguzaz.pdf
    • https://cdn.shopify.com/s/files/1/0440/6801/2182/files/90707758325.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/ratunagarulokaleze.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/38663819976.pdf
    • https://cdn.shopify.com/s/files/1/0435/4523/1515/files/kodivitobifeladoxofiki.pdf
    • https://cdn.shopify.com/s/files/1/0429/9866/1279/files/89551732662.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8757/files/10164338545.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006062.bin
f68121581b1f2a9cb643b8e131b1745f525a1fee755b22165e6f996f4a8a9d6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6062 4920 bytes
font_01_sfnt_off00007186.bin
4ec9d3c81f32ad0ecdc4fe80df7580e7df70f999d5ae501734627dc7130ee11f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7186 5172 bytes
font_02_sfnt_off00008308.bin
d646af2eb9a22d78132c5874e76ef2e285d7e7c80f6d1c2cda00aa26f31ff8dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8308 10156 bytes

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