Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7742443ca4840f2…

MALICIOUS

PDF

38.0 KB Created: 2020-08-17 13:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea561fd1e4b0bcbf0b0d514375dc147b SHA-1: 581d519c1b37f7d0769e7de47a132396ada65d73 SHA-256: c7742443ca4840f2bc81a2dfbf07f5f31808aee2b1dc602c207601321036599c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=guide+champignons+comestibles+pdf'. The document body, though partially corrupted, suggests a lure related to edible mushrooms. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to redirect users to potentially harmful 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.com/pify?keyword=guide+champignons+comestibles+pdf
    • http://files.throttle-steer.com/uploads/1/3/1/4/131406985/1984751.pdf
    • http://ligovexes.jcottergallery.com/uploads/1/3/2/8/132814930/ludujo.pdf
    • http://memuweja.spiralingupsolutions.com/uploads/1/3/1/3/131384635/3262269.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/48029167487.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/autocad_2020_shortcut_keys_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/3733/5464/files/stainless_steel_microstructure.pdf
    • https://cdn.shopify.com/s/files/1/0432/0650/8701/files/elementary_differential_equations_10th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0435/2039/3375/files/10055958480.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/zazilu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/agnes_obel_september_song.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/74152975595.pdf
    • https://cdn.shopify.com/s/files/1/0434/2644/7525/files/nifisako.pdf
    • https://cdn.shopify.com/s/files/1/0448/9697/7051/files/dna_lyrics_kendrick.pdf
    • https://cdn.shopify.com/s/files/1/0436/9353/9478/files/vasusemu.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_off0000561b.bin
0ffcc0fcb66a39a524181686aeccd51c833194c272599545d29d241918ade7ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x561B 5644 bytes
font_01_sfnt_off00006929.bin
d07956f3c21cb9232e0d6659ad604c7510ead791257c12a3f277ab499f4bef09
pdf-font-stream PDF embedded font (sfnt) at offset 0x6929 9992 bytes