Malicious PDF — malware analysis report

Static analysis result for SHA-256 250eb99df5f6efdc…

MALICIOUS

PDF

57.9 KB Created: 2020-08-04 12:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bceb53550ec5e5666d2341175bf23b9 SHA-1: f503aad229068b50ae85b2a45d34db544ed56c69 SHA-256: 250eb99df5f6efdcd9ed7d720fd55b6f2626ddbff5027e5ecd9c208f8c7afe58
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with the primary link pointing to a redirector service. This suggests a phishing or malicious content delivery attempt where the redirector is used to obscure the final destination. The ML classifier strongly supports the malicious nature of this PDF. 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.com/pify?keyword=los+aines+pdf
    • http://files.bybcapparel.co.uk/uploads/1/3/0/8/130814286/repozagobotitu_pumugeduziv_xesalezigixuva_nudufomevute.pdf
    • http://files.jwedensinsurance.net/uploads/1/3/1/4/131453109/magat.pdf
    • http://files.lafemmestyling.com/uploads/1/3/1/1/131163590/429caab270eac2c.pdf
    • http://files.mrdougcampbell.com/uploads/1/3/2/7/132740682/7233625.pdf
    • http://files.safebabyhappymommy.com/uploads/1/3/0/9/130969061/d1cb2b0.pdf
    • https://cdn.shopify.com/s/files/1/0435/6341/7759/files/20560349678.pdf
    • https://cdn.shopify.com/s/files/1/0440/8626/3960/files/gimogugepoginuxozomaleluk.pdf
    • https://cdn.shopify.com/s/files/1/0430/3909/6986/files/89522784899.pdf
    • https://cdn.shopify.com/s/files/1/0436/1352/0029/files/17493214000.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/79274889727.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/pizixokupijatepesutaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5591/files/21789519754.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/silif.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/sokiwowoxojagux.pdf
    • https://cdn.shopify.com/s/files/1/0433/5550/4795/files/64815116614.pdf
    • https://cdn.shopify.com/s/files/1/0428/9075/6259/files/kepijusorovipupew.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_off0000964f.bin
5f78ae46a1eb8d512af5e8f1b87f868895137abfa8dde5f2e9cc5345b0cd7892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x964F 4556 bytes
font_01_sfnt_off0000a5d7.bin
fd52e1e75a215dd54f8e5e759bef4fbc25604880a823473c21d33d483b3f07ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5D7 11672 bytes
font_02_sfnt_off0000cb91.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB91 4324 bytes

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