Malicious PDF — malware analysis report

Static analysis result for SHA-256 08584d25e5486a87…

MALICIOUS

PDF

40.6 KB Created: 2020-09-12 13:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0c0ca6cef8ab364a512a26be1662018 SHA-1: 36845fa1b24cd29d6538229de7639b59ca8a91e0 SHA-256: 08584d25e5486a8791045d52868893f356ab0847871b3990f15bff0f474af0bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting a link farm or redirection scheme. 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.club/pify?keyword=cortana+apk+lollipop
    • http://files.riveterlaw.com/uploads/1/3/1/6/131636988/77a5768.pdf
    • http://files.naturalnat.com.au/uploads/1/3/1/3/131379343/paxewil.pdf
    • http://files.andreawelsh.com/uploads/1/3/1/3/131379477/4205137.pdf
    • http://musifiz.goreybypass.com/uploads/1/3/1/6/131606490/41f19afcea6.pdf
    • http://files.healerjbonnie.com/uploads/1/3/1/4/131437107/4754808248c39d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b0b521_239eb1ed36bf42cfbf7320ba3d10806d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fd49c83dee04e82a9ad8695ef5cdc45.pdf
    • https://static.usrfiles.com/ugd/4dd980_5672a1c98cef4a1c894208466d5a0612.pdf
    • https://static.usrfiles.com/ugd/5926b4_c31410c190784c04aa01bc7ab3bfcf30.pdf
    • https://static.usrfiles.com/ugd/7041e4_c13d7c75d15f4551839b740aecf00d79.pdf
    • https://cdn.shopify.com/s/files/1/0465/3953/8582/files/tudes.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6290/files/audio_video_mixer_software_for_pc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000561a.bin
368ba0c39db24b926daaea1e3c169cfd33121b840777dfa3314b02c2a3053008
pdf-font-stream PDF embedded font (sfnt) at offset 0x561A 4392 bytes
font_01_sfnt_off000064fe.bin
65e0c700a58a545507d1f3d8266cfbf2816c4b90897f01f9617b8b87a17fef1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x64FE 10152 bytes
font_02_sfnt_off000087c4.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x87C4 4324 bytes