Malicious PDF — malware analysis report

Static analysis result for SHA-256 18378e64e2fa280f…

MALICIOUS

PDF

44.3 KB Created: 2020-08-05 04:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38c334f7cb7800946eb960a962eb781f SHA-1: bc22fc613022c232da8d99aa59e9dd94c47a9870 SHA-256: 18378e64e2fa280fef117b2caf123bdc77b2fd925954d49c7d8b653c56ff4370
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a reference to 'Autocad architecture 2020 pdf' and a URL that appears to be a lure. The presence of numerous links, including one to a known malicious redirector, suggests an attempt to direct users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=autocad+architecture+2020+pdf
    • http://dujad.hope-medical.org/uploads/1/3/0/8/130814328/zaxuk.pdf
    • http://files.aanddkin.com/uploads/1/3/1/0/131070651/gezemuzide_wozikitarojur_medopimajogened.pdf
    • http://files.espsinc.net/uploads/1/3/0/7/130739183/47343c604.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/guxidasuxirivipufazafowu.pdf
    • https://cdn.shopify.com/s/files/1/0439/4532/8808/files/terolozakokis.pdf
    • https://cdn.shopify.com/s/files/1/0437/8414/3010/files/how_much_is_protosmasher.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85286147205.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/4991279701.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/78194960754.pdf
    • https://cdn.shopify.com/s/files/1/0429/4737/9356/files/sulogetiwek.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/xufuvademukemu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4917/files/labufexivazoxixanelo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9479/3630/files/dexoturen.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/bigusefodusenota.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/base64_to_ionic.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/java_language_basic_concepts.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_off00006e83.bin
d3ac2f50fd392088c4156716990346cff40eb2b2c503d13e73f5dcb806bdd3a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E83 5296 bytes
font_01_sfnt_off00008086.bin
4f08ece3797f5cf755e6873450b6477780c91a78381bb427b0252263e23444b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8086 10664 bytes

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