Malicious PDF — malware analysis report

Static analysis result for SHA-256 8607fc3fce843378…

MALICIOUS

PDF

43.8 KB Created: 2020-08-18 23:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d63e7fc034386d4b2758e6952f0b11a0 SHA-1: f258997a081812b2d8af0dcbe593752020d04bfb SHA-256: 8607fc3fce843378d6cff0819aa0f8d996f42cef9e563cccdf9934c4cfbbc03e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'soft skills vs hard skills worksheet' and includes the malicious URL. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to obscure the ultimate destination.

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=soft+skills+vs+hard+skills+worksheet
    • http://files.erik-myers.com/uploads/1/3/1/0/131069887/sasoga.pdf
    • http://nojaju.newsummitacademy.com/uploads/1/3/1/4/131483400/bigotiretus_zenomadosegu_jujos_dikizukunamatoz.pdf
    • http://files.kaseimart.com/uploads/1/3/0/9/130969525/5dee16.pdf
    • http://notazuv.matthewhavertz.com/uploads/1/3/2/6/132682883/jukarejokofowi.pdf
    • http://files.melissaskirboll.com/uploads/1/3/0/9/130970003/d9f9c0770131.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/fedipo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3929/1554/files/47662561697.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bewasovenajuwawofitef.pdf
    • https://cdn.shopify.com/s/files/1/0431/6862/8890/files/82123158402.pdf
    • https://cdn.shopify.com/s/files/1/0430/5482/5621/files/behavioral_theory_of_personality.pdf
    • https://cdn.shopify.com/s/files/1/0436/9137/6794/files/fepizuxutoxibemufim.pdf
    • https://cdn.shopify.com/s/files/1/0429/3620/5479/files/gakuzebuzowukavilibusog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pesaveput.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2426/files/sosidemoruror.pdf
    • https://cdn.shopify.com/s/files/1/0434/0868/7269/files/punik.pdf
    • https://cdn.shopify.com/s/files/1/0435/9425/2456/files/50216981870.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/midpoint_and_segment_bisector_worksheet.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_off00006bce.bin
8cfb54b0b18e1f2faad1725e3910232680e9f62c9c451a0fa70aa3e1b21b76ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCE 5316 bytes
font_01_sfnt_off00007de3.bin
64cec88dc11290e78bc79928de2ea3d5772e69a77953fd8fe72e55e2651fed8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE3 10572 bytes

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