Malicious PDF — malware analysis report

Static analysis result for SHA-256 406c09a771e976c9…

MALICIOUS

PDF

38.5 KB Created: 2020-09-06 03:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cc5afe99147bea0d9f94fe1325a4e5e SHA-1: 9b3fc2fb7f56e33af56b35ef9150d0bb01c29fe5 SHA-256: 406c09a771e976c9ad2d8ba01b84b437051256b3dcf7443b58250d4a93bf6973
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with the primary malicious URL being a redirector. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, suggesting a lure or SEO manipulation tactic.

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/wix?keyword=dewsbury+and+mirfield+reporter+obituaries
    • https://cdn.shopify.com/s/files/1/0433/8896/0924/files/pocket_anesthesia_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/91202225735.pdf
    • https://cdn.shopify.com/s/files/1/0463/4332/3805/files/22303362218.pdf
    • https://cdn.shopify.com/s/files/1/0464/7095/5166/files/89716412742.pdf
    • https://cdn.shopify.com/s/files/1/0429/3145/4119/files/ennahar_journal_algerien.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/fosewenavaxasirez.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8095/files/autobahnkarte_schweiz.pdf
    • https://cdn.shopify.com/s/files/1/0461/7866/4602/files/56881084871.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/basilsila_ta_azal.pdf
    • https://cdn.shopify.com/s/files/1/0430/9650/6521/files/71712450978.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0156/files/up_anganwadi_online_form_last_date.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/oxford_dictionary_english_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/undertale_soundtrack_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/3548/2517/files/delixap.pdf
    • https://cdn.shopify.com/s/files/1/0434/6966/8517/files/84142277910.pdf
    • https://cdn.shopify.com/s/files/1/0439/5070/2750/files/supexi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1628/0475/files/xuniv.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_off00005882.bin
4517d97b787d6c38297c1867d8f9f4a6d3b72544c52f3be50503424885d84b2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5882 5520 bytes
font_01_sfnt_off00006b47.bin
0d880a9969c1a84f5b126752ffb199254397d1b8366b962d3ae31b2e75a3564d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B47 9836 bytes

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