Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b15d0e1753b9e20…

MALICIOUS

PDF

45.7 KB Created: 2020-08-12 17:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 159fbdbe430ff7c6a06d00299506b54d SHA-1: 162dbded3239abb4b69c9fdad3d4db3579860a11 SHA-256: 8b15d0e1753b9e20f04e9ff77ae4a16a48facbd8bc681cde95f2638d4daa2b53
152 Risk Score

Malware Insights

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

This PDF document was identified as malicious due to a high number of embedded links, many of which point to a redirector service. The document body, though malformed, contains a URL that is also present in the heuristics, indicating a likely attempt to lure users to malicious content. The ML classifier strongly supports the malicious verdict.

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=manual+de+cooperativismo+y+econom%25C3%25ADa+solidaria+pdf
    • http://files.thestorystudiohk.com/uploads/1/3/1/1/131163635/tixefe_pejetadoxap.pdf
    • http://wixafanop.brewsterranchandtack.com/uploads/1/3/1/0/131069934/84640327484d26c.pdf
    • http://files.shangrilavintage.com/uploads/1/3/1/1/131164425/wufikavom.pdf
    • http://lokuwij.carsandcrochet.com/uploads/1/3/1/0/131070314/fofimoserixufa-bunipanib-fuburebuneko.pdf
    • https://cdn.shopify.com/s/files/1/0430/5390/8117/files/68420946984.pdf
    • https://cdn.shopify.com/s/files/1/0432/0192/1184/files/muxalodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/rafigadosisupanuvu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/jquery_post_with_payload.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sotuxinonuwirumedubisaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/5021/2264/files/japurogoditema.pdf
    • https://cdn.shopify.com/s/files/1/0433/7631/2471/files/xezakizigu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9464/7719/files/rikabesevuwat.pdf
    • https://cdn.shopify.com/s/files/1/0437/9413/7249/files/bukhari_shareef_hadees_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4647/7725/files/numpy_random_number.pdf
    • https://cdn.shopify.com/s/files/1/0435/2072/1055/files/94981619704.pdf
    • https://cdn.shopify.com/s/files/1/0440/5395/4710/files/20433454383.pdf
    • https://cdn.shopify.com/s/files/1/0437/3073/1173/files/atex_hazardous_area_classification.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_off00006f3f.bin
7ee4c77ec3900d6a92b3f8297431d260dc3ed88fa0f9131c69698bae7edce693		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3F 5524 bytes
font_01_sfnt_off000081fd.bin
93d2e7abb2b035d54fb7b239ce431222c4165c60a2007bf8361b864d3cedaeac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81FD 11188 bytes

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