Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e51525cff79603…

MALICIOUS

PDF

41.2 KB Created: 2020-09-07 07:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28023af75fae29cd9482660df6ba84ea SHA-1: 027aa37dadda09f05264a5f7ee4c479d20048cb6 SHA-256: 65e51525cff79603aa6c30f4d6449923f337d2da662e9a5a8b39c2d565cc3c1e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a lure related to an "apprenticeship levy explained pdf" and includes a link to a known malicious redirector. Heuristics indicate this is an advance-fee scam, likely aiming to trick users into visiting the malicious URL for a fake prize or parcel. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious link and the scam lure are strong indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=apprenticeship+levy+explained+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/f2c1dc_c04e42bca2794435aa356c2c5067627b.pdf
    • https://static.usrfiles.com/ugd/4b874d_bbc52d9bf0d541b8af4ef68caa041524.pdf
    • https://static.usrfiles.com/ugd/516793_3a8af283f6234498b8c21465562c8ae5.pdf
    • https://static.usrfiles.com/ugd/7dfe85_d36fbe01759a4f54b2de9cdd7d43722e.pdf
    • https://static.usrfiles.com/ugd/b8c837_6894813311ff41af9bd0b299cfb4c72e.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5317/files/38738164465.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/hssc_lab_attendant_syllabus_2018.pdf
    • https://cdn.shopify.com/s/files/1/0437/8784/5790/files/windows_98_boot_disk.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7504/files/xosomogukax.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/1455988402.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8565/files/cancioneros_catolicos_con_acordes_para_guitarra.pdf
    • https://static.usrfiles.com/ugd/a4e402_630d8569caea4f47935d346ef58f3f2e.pdf
    • https://static.usrfiles.com/ugd/902d29_5a30df14248a4ebd98160c97355f3be1.pdf
    • https://static.usrfiles.com/ugd/77941b_c162dda1252e43e0ad41115f37dae901.pdf
    • https://static.usrfiles.com/ugd/938c70_4181a8e8a692435b9e0c833a39809ea4.pdf
    • https://static.usrfiles.com/ugd/de60da_ceb044e467534ea799bb726f575f2665.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000628c.bin
61d02e62adf9ce36129313856c42c840172e59c92580289e31d42a34953f465e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x628C 5464 bytes
font_01_sfnt_off0000752f.bin
7eb81dc2aac3d56bf393d21b2274c0868cc2eeedf64dc03d3d9cb2c37b7f1082		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752F 10244 bytes

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