Malicious PDF — malware analysis report

Static analysis result for SHA-256 118c3fc6451c8bea…

MALICIOUS

PDF

36.2 KB Created: 2020-08-14 11:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33262effcd65367e1d115d37c4e8a5d5 SHA-1: 85ad6973f447f5d7db766093eae0fa560a6eb1fa SHA-256: 118c3fc6451c8bea88cbeb87485b4c5002c5c2b1b9b009458d2045ae94ea0b1b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also flagged the PDF as malicious with high confidence. The document body, though partially garbled, includes a URL that is also flagged as a malicious redirector, suggesting an attempt to lead users to 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=serious+illness+conversation+guide+ariadne
    • http://files.attractionmania.com/uploads/1/3/1/3/131382030/3310085.pdf
    • http://files.kidsonup.com/uploads/1/3/1/4/131408209/wokexagefefagesegeb.pdf
    • http://files.loxhomeinspections.com/uploads/1/3/1/3/131398455/8e66d958.pdf
    • http://kikovu.ovbtc.com/uploads/1/3/1/4/131408159/zejiw.pdf
    • http://files.zenbeautyspa.com.au/uploads/1/3/0/7/130740502/begizitepalo-wusot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70686619693.pdf
    • https://cdn.shopify.com/s/files/1/0437/9875/7538/files/kejik.pdf
    • https://cdn.shopify.com/s/files/1/0433/8581/5194/files/uwu_chrome_extension.pdf
    • https://cdn.shopify.com/s/files/1/0431/9815/2866/files/evidence_based_research.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/12_note_kalimba_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/wobiviluxosezikup.pdf
    • https://cdn.shopify.com/s/files/1/0430/5856/1173/files/gambar_daun_binahong.pdf
    • https://cdn.shopify.com/s/files/1/0430/2848/0157/files/63123547393.pdf
    • https://cdn.shopify.com/s/files/1/0430/1943/6185/files/life_after_death_book_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/81283419213.pdf
    • https://cdn.shopify.com/s/files/1/0436/0785/1171/files/26470921962.pdf
    • https://cdn.shopify.com/s/files/1/0430/9729/2949/files/18722386847.pdf
    • https://cdn.shopify.com/s/files/1/0437/6998/7223/files/amphenol_fci_full_form.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_off0000502c.bin
ce92cabc24646e048d6a7b8efc6cb964e641c3e38f6666c50826880e40a95717		 pdf-font-stream PDF embedded font (sfnt) at offset 0x502C 5272 bytes
font_01_sfnt_off0000621b.bin
501340f3df3bd4838c0fda140e15533be380da3b193b224976e2204319ce85f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x621B 9856 bytes

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