Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d0682da11b690c…

MALICIOUS

PDF

38.6 KB Created: 2020-09-16 16:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de70eb8415f2924af17884ef9bfefb79 SHA-1: 2ba37cae7fd32124ce6ab338f424610117d0c5c7 SHA-256: a0d0682da11b690cb746f4ee8576ffbf0228a7605d512bfa39f19a791b8229cd
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous embedded URLs, including a primary redirector URL and a large set of links pointing to PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or conduct phishing attacks.

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.me/wix?keyword=fox+valley+guide+service
    • http://files.pawsitiveperspective.net/uploads/1/3/0/9/130969986/livunefo.pdf
    • http://files.rollsroyceweddingcarsuk.com/uploads/1/3/0/8/130814339/suludu-rilamoruraf-fakaremabuw-fanelonifutiko.pdf
    • http://files.naturalealternatives.com/uploads/1/3/1/4/131411199/e31a421b.pdf
    • http://files.thefeduppharmacist.com/uploads/1/3/1/1/131164552/novolowow.pdf
    • http://begowu.artoutofblack.com/uploads/1/3/2/6/132680839/vituliwivobe_nuwifu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6818/files/nagulojubirezexonud.pdf
    • https://cdn.shopify.com/s/files/1/0437/2817/5265/files/kabokizite.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/identify_vertex_and_axis_of_symmetry_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/2166/2365/files/xixawavisuxefekiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/surface_anatomy_of_upper_limb.pdf
    • https://5394bd69-7f58-4bfd-905e-a4214a82771a.filesusr.com/ugd/18ee90_1c93ce2085ea4a50bc19518981dc1924.pdf?index=true
    • https://c2f78dcc-34b2-4c89-bbea-62a95e335b65.filesusr.com/ugd/417718_cd5d4cb6859f4118913bd7120a5c4cd1.pdf?index=true
    • https://e20402cb-1f38-4d9e-ad39-0278431cbd12.filesusr.com/ugd/b56239_c2bf964813924686936b9e82ac5abbd7.pdf?index=true
    • https://502a5812-98d7-4160-8675-f039f5f003dd.filesusr.com/ugd/370021_ba743e844c404b6b8ba6a1d746b8fa75.pdf?index=true
    • 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_off00005755.bin
963fecbf5300c8e446db0150311f31e1b0f2a47ae7174510177ebbde0e75bb4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5755 5292 bytes
font_01_sfnt_off0000697c.bin
1eab18a2d8959edd36cbeb4baf0cce660da98e1ec65b39581d045d659c181161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697C 10176 bytes

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