Malicious PDF — malware analysis report

Static analysis result for SHA-256 991ce766ba430601…

MALICIOUS

PDF

40.6 KB Created: 2020-08-20 08:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 114e29dea9a3f3759f6452e8b1b6fce1 SHA-1: cade8ff93894a461c1249bea2a9b5fc7a888cbf2 SHA-256: 991ce766ba430601b0885dd6dd711b17cb50f149ed065ae7700e3b7cc4c80db9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a specific malicious redirector URL, disguised as an employment contract template. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates the primary URL leads to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document's structure and embedded links suggest a phishing or redirection attempt.

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=california+employment+contract+template
    • http://dexet.spencerflyingservices.com/uploads/1/3/0/7/130739553/7429020.pdf
    • http://patolik.onembiss.com/uploads/1/3/0/7/130739006/32bee3d9.pdf
    • http://torudo.northshorehomes-seaside.com/uploads/1/3/1/6/131606875/73275.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9703/files/alibaba_and_40_thieves_story.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/25859083015.pdf
    • https://cdn.shopify.com/s/files/1/0440/3593/2310/files/ffxiv_miner_levequests.pdf
    • https://cdn.shopify.com/s/files/1/0430/2487/5674/files/nenuxagapoxoxumataf.pdf
    • https://cdn.shopify.com/s/files/1/0436/2030/3011/files/gapupusutavero.pdf
    • https://cdn.shopify.com/s/files/1/0427/6987/5111/files/97991744635.pdf
    • https://cdn.shopify.com/s/files/1/0443/0325/3660/files/define_the_platform_independent.pdf
    • https://cdn.shopify.com/s/files/1/0433/6294/3144/files/vobalit.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/857546876.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/analytic_geometry_examples_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/sifeb.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_off00005273.bin
d6ca639dedec18b96cb75fdbf713f9b18adf3c7dfe3ea928a49e8947a2fde550
pdf-font-stream PDF embedded font (sfnt) at offset 0x5273 4896 bytes
font_01_sfnt_off00006307.bin
02aaeeaec91c526d9caa53ea22320f583f027b3f699731f3004ca7baf03827e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6307 10468 bytes
font_02_sfnt_off000086d6.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x86D6 4324 bytes