Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a8ebc5d6e7c79a…

MALICIOUS

PDF

70.7 KB Created: 2020-08-05 04:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e72e90368c3eb111a892e9ede8322d6a SHA-1: c3d2b34f0ed43a6f8d44781b752edf48342760b9 SHA-256: d5a8ebc5d6e7c79abcc8e25ea04e24c50995dada3c9328e2c738a54222f0a7f7
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a redirector link to a known malicious domain. The document body, though partially corrupted, includes the URL that triggered the heuristic, suggesting a lure to a malicious site. The presence of numerous external PDF links, many hosted on Shopify, further supports a link farm or redirection 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.com/pify?keyword=five+types+of+adsorption+isotherm+pdf
    • http://files.rsvptravelvisas.com/uploads/1/3/2/6/132695636/2074909.pdf
    • http://files.drgvick.com/uploads/1/3/0/7/130738911/ralosijinis.pdf
    • http://files.usmilitaryhonors.org/uploads/1/3/1/6/131606526/8706758.pdf
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/75018892040.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/10937730087.pdf
    • https://cdn.shopify.com/s/files/1/0427/9900/5863/files/gimp_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0436/2141/7122/files/kista_epidermoid_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0428/3275/6902/files/jirukav.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/retalipolilivegasisomezo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/78271316265.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/romanticism_characteristics.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/6036130603.pdf
    • https://cdn.shopify.com/s/files/1/0437/8217/6920/files/vokuxarejuzewuge.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/lowes_wheelersburg_ohio.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b37f.bin
c588eea8a047fa4eb07f542ba62fadfac9dd8622540312fe82fba6e77ad909b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB37F 1768 bytes
font_01_sfnt_off0000bc01.bin
214f325fb162c195ed6db943d5bde075fc4006df20f317539c9d6f49c7692ebb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC01 5368 bytes
font_02_sfnt_off0000ce27.bin
e8c4021bc485039b01fd1571662f57d8288aba297c02da73c8e958b5622e1c69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE27 12732 bytes
font_03_sfnt_off0000f7e0.bin
b5682870b59277f122a7b73a3e153b638509675612808f534710e7f5036a4878		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 16192 bytes

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