Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b798a705d55119…

MALICIOUS

PDF

37.5 KB Created: 2020-10-05 10:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 46c2513dd7c54afcee4346752653ec0b SHA-1: f8f5ba7041b211a79804904a4b4b83d03e590d23 SHA-256: 35b798a705d551197273d92f7862786e9c3b45ffdbfe5a995d8233f3e9580396
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, specifically for containing a large number of external links, including one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The embedded links likely serve as a link farm or redirect users to unwanted 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.link/pify?keyword=muscles+of+the+shoulder In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1296/3482/files/64697891102.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/5975/8492/files/30382456927.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8847/8365/files/28371245363.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9217/1165/files/cell_cycle_and_mitosis_coloring_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5899/4088/files/genisijufex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9599/0175/files/ap_art_history_painted_elk_hide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8783/8886/files/8796553675.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5664/7322/files/idle_heroes_broken_space_event_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5015/3622/files/gusovewuja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/mojamadaxabaxozukom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0949/8536/files/guitar_rig_5_player_reddit.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000584e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x584E 4904 bytes
SHA-256: bbb6cfb47278056da7034321b561f5d3e3b299a5b987692e639057699295e745
font_01_sfnt_off00006900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6900 9596 bytes
SHA-256: 72ab871f4c0fa221c4ca7e3f9a135ad24acf74fbfcec1469ed78adaa5bb5651a

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