Malicious PDF — malware analysis report

Static analysis result for SHA-256 31045618b4ada3f9…

MALICIOUS

PDF

42.8 KB Created: 2020-08-25 00:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e8e3b382cd822c222676c4396ba2316 SHA-1: 3077fd456715b6ca696ac35e3396997f951c5f88 SHA-256: 31045618b4ada3f9c79e3aab66ecf8976605706b417b24efb913147c3a1e3849
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Android studio google play app signing' and a URL that appears to be part of a link farm designed to manipulate search engine results. This suggests a phishing or scam attempt, likely aiming to redirect users to malicious content.

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=android+studio+google+play+app+signing
    • http://files.itsonlyblogical.com/uploads/1/3/0/7/130776277/fubuwamobij.pdf
    • http://gunape.camandmica.com/uploads/1/3/1/6/131637830/tikoligerelanenup.pdf
    • https://cdn.shopify.com/s/files/1/0459/9260/7901/files/rmlau_registration_form_online.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/25631794975.pdf
    • https://cdn.shopify.com/s/files/1/0429/1792/0934/files/49101185607.pdf
    • https://cdn.shopify.com/s/files/1/0461/5431/7987/files/konami_football_games_apk.pdf
    • https://cdn.shopify.com/s/files/1/0435/8216/1053/files/6679077537.pdf
    • https://cdn.shopify.com/s/files/1/0430/9529/4109/files/reactions_of_cycloalkanes.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/35656748680.pdf
    • https://cdn.shopify.com/s/files/1/0434/2202/3847/files/18688614054.pdf
    • https://cdn.shopify.com/s/files/1/0434/7042/2180/files/nelep.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_off00006944.bin
09268da5f5d33db0cd59c662d333bcb22bd96bfd7a34a0b1ce0ce3ea4afac84f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6944 5220 bytes
font_01_sfnt_off00007b10.bin
fed928421d2e42f22abc2049f4bc76d7df346a96449386942d0fe4f0f73f9dfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B10 10492 bytes

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