Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d332b678822f798…

MALICIOUS

PDF

36.6 KB Created: 2020-08-31 14:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b37f1e1d65d38e51bc5acb72e25abe35 SHA-1: 9b91bf805bc2224e14096bff40f6da7180538d05 SHA-256: 5d332b678822f79883a602672da28dd952f646663c71917919a689a987469163
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, disguised as search results for educational materials. The ML classifier strongly indicates maliciousness. The document body and embedded URLs suggest a phishing or scam attempt to redirect users to malicious infrastructure.

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.cc/pify?keyword=algebra+2+book+pdf+pearson
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4705/0661/files/vuzinejosozujopada.pdf
    • https://cdn.shopify.com/s/files/1/0432/0172/4580/files/finalaverura.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6201/files/algebra_2_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/4598/5179/files/latex_cheat_sheet_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9423/files/5425273744.pdf
    • https://cdn.shopify.com/s/files/1/0429/9715/3943/files/belimezalijuvorafigelo.pdf
    • https://cdn.shopify.com/s/files/1/0469/0483/6258/files/bajada_de_cargas_de_una_casa_habitacion.pdf
    • https://cdn.shopify.com/s/files/1/0434/3375/4773/files/71105281285.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/sitixuwumodeteviponafev.pdf
    • https://cdn.shopify.com/s/files/1/0438/9843/7787/files/word.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mirogorozizodixomalejog.pdf
    • https://cdn.shopify.com/s/files/1/0435/5339/0743/files/70620981222.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2165/files/venilap.pdf
    • https://cdn.shopify.com/s/files/1/0434/6976/6808/files/woxasokafegokume.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_off00004f90.bin
206620b450056090af952edcef442d56935d6bb4483dec51ca67b47a7b054a73
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F90 5532 bytes
font_01_sfnt_off00006275.bin
6424b8279c5c57a54415926dfa9422920eab76a6533d00c04ccc852490855ab6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6275 10420 bytes