Malicious PDF — malware analysis report

Static analysis result for SHA-256 b610677e8954f57b…

MALICIOUS

PDF

42.8 KB Created: 2020-08-10 07:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d539483d81c095604d2e457b25330efe SHA-1: a69f4769ecf3aeed927836059670932ad20f37aa SHA-256: b610677e8954f57b8281ef981c2cf2673144e3e27788a24c1c2a932e754a9d3f
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 suggesting it is disguised as educational notes, likely to trick users into clicking the malicious link. The presence of a link farm and a malicious redirector indicates a phishing or malware distribution 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.com/pify?keyword=nationalism+in+europe+class+10+pdf+notes
    • http://files.nellsanders.com/uploads/1/3/0/8/130874124/wurunowujawenux.pdf
    • http://files.ischiareview.com/uploads/1/3/2/7/132740494/diwomebovekaju_gokak_xotiwaponiri_lawozuteliri.pdf
    • http://xutij.lacasacannabis.com/uploads/1/3/1/3/131379965/waserumumem.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7600/files/24479708147.pdf
    • https://cdn.shopify.com/s/files/1/0432/9694/8382/files/use_of_modal_verbs_in_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/jokajivazajonogejowa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4721/4486/files/difference_between_deontological_and_teleological_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0434/5220/3161/files/strong_enough_lyrics_matthew_west.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56655156305.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/kofaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70354855800.pdf
    • https://cdn.shopify.com/s/files/1/0449/5894/1343/files/pdf_file_editor_offline.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6201/files/pembentukan_batuan_sedimen.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/29363888566.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/sikandar_ccna_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1865/files/adverb_examples_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/0192/1184/files/roduwebexabasabi.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_off0000695d.bin
103d3335cb5a9a7bcad022ace7b583bdaeb119892c768edfe0bef6a580a88fbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695D 5464 bytes
font_01_sfnt_off00007be4.bin
802e8afa10deddebf387f95168d3d0eca12db6976d7b2a198955080ce4d4b936		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE4 9980 bytes

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