Malicious PDF — malware analysis report

Static analysis result for SHA-256 058cd87b48cec3bc…

MALICIOUS

PDF

41.2 KB Created: 2020-08-21 14:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b33a1bb0c6d8cf042b870b761330640 SHA-1: a0ac1eb2800527e988f745e8d0edfee96fb6d34c SHA-256: 058cd87b48cec3bc2d30823a26b15dde4182b1806518047280150d7715b1c3d7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text fragments and URLs consistent with an advance-fee scam, aiming to trick the user into clicking malicious links. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=legends+survival+battleground+apkpure
    • http://files.tsfabricator.com/uploads/1/3/0/8/130814605/8811701.pdf
    • http://fuduna.apesbio.org/uploads/1/3/1/4/131438392/ca5551.pdf
    • http://files.lotusenergyandmassage.com/uploads/1/3/1/8/131856700/13fe9ad.pdf
    • http://files.faithssrd.com/uploads/1/3/2/6/132682233/xebudo-rokifi-falijoxewiza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4832/1692/files/30844948103.pdf
    • https://cdn.shopify.com/s/files/1/0451/0570/9219/files/biological_wastewater_treatment_principles_modelling_and_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/1261/1481/files/risk_management_process_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/7929/4358/files/ramagetazujefe.pdf
    • https://cdn.shopify.com/s/files/1/0427/6885/9303/files/zerajezomofobapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/97490647397.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/26245463179.pdf
    • https://cdn.shopify.com/s/files/1/0433/7251/1386/files/8115760795.pdf
    • https://cdn.shopify.com/s/files/1/0428/3301/9047/files/zekaregupurogolivagexoj.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_off00005c06.bin
e689f7d7d97b46027525980210db21e8fd42902a2a20e5e1da8ca512a1c5a1b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C06 5332 bytes
font_01_sfnt_off00006e3e.bin
84fcb5c81d13e73cd2360ab8382564fa2a1a7f5e9cccb9b64ff878953fcf3598
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3E 12732 bytes