Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d99679375d5fa9…

MALICIOUS

PDF

43.2 KB Created: 2020-08-29 22:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb779503ba396da4ff8f30f850969c71 SHA-1: 280663176c2448ee76a43ee16dce0caa0a68e931 SHA-256: d7d99679375d5fa90906cbb50183dafb29cfcb1d16c64431293738dca01719d2
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'wansview ncb541w setup software down' and a URL that appears to be part of a link farm designed to lure users to external sites. The heuristic firings confirm the presence of malicious redirector links and a link farm within the PDF structure. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=wansview+ncb541w+setup+software+down
    • https://static.usrfiles.com/ugd/b8c837_9690b3e34f7743159963d5027f40e0e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb823b2bf3bf42fab79ae2377cbac88d.pdf
    • https://static.usrfiles.com/ugd/b8c837_271cbeca9dab4340b6fc9ed23a2e7d22.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c2b4949788c4213a65bdd99df67cc4b.pdf
    • https://static.usrfiles.com/ugd/b8c837_bff4998c205e45298f11042c574171aa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8795/files/new_york_hindi_movie.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8888/files/26225971181.pdf
    • https://cdn.shopify.com/s/files/1/0438/8365/9419/files/fluke_1503_megger_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/anime_direct_download_mp4.pdf
    • https://static.usrfiles.com/ugd/3b7182_a71e7ce6fb9947178aee8fc31a609b35.pdf
    • https://static.usrfiles.com/ugd/b80405_d3c6f2363df94077912934781c01164b.pdf
    • https://static.usrfiles.com/ugd/0aab01_38b7be80b8ad4f15862275c5d634d3c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8c25b3b1e3b488087489b27d736c541.pdf
    • https://static.usrfiles.com/ugd/b8c837_3de24aa2e02444faad2c99620df847ab.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/4297122888.pdf
    • https://cdn.shopify.com/s/files/1/0437/1388/8405/files/entorage_episode_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/3421/2509/files/badmashi_song_sidhu_moose_wala_djpunjab.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_off0000669c.bin
b56ad21be7b6ca2c57b08787eed103839ae6e2f04373f590a4af76eca7034bdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669C 5684 bytes
font_01_sfnt_off00007a26.bin
17c1aff66fbc63f5d66aa76b3a4ac84bcfd32dcdb3662fb631804a32193c693f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A26 11256 bytes

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