Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89aacc62e6d1bcd…

MALICIOUS

PDF

43.8 KB Created: 2020-09-03 10:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e16a4b822167b6b10bf50179b445bb6c SHA-1: b265c879c8ea3eb84e39dbf81bce63d3eb4040d0 SHA-256: b89aacc62e6d1bcd4768c430dbce5c59cb2cebde067b72467d1c8fd75d1ba708
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that initiates the redirection. The PDF also contains a large number of embedded links, as noted by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO poisoning tactic to distribute malicious content. 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/wix?keyword=hound+of+the+baskervilles+book+report
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lufixupiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/5670493421.pdf
    • https://cdn.shopify.com/s/files/1/0438/0036/3170/files/assassin_s_creed_identity_apk_app_mirror.pdf
    • https://cdn.shopify.com/s/files/1/0429/3722/1276/files/newspaper_word_template_mac.pdf
    • https://cdn.shopify.com/s/files/1/0429/8981/3909/files/47440083707.pdf
    • https://static.usrfiles.com/ugd/d1c05f_0b9980316fd1483298365134bb7b3274.pdf
    • https://static.usrfiles.com/ugd/b8c837_71bf78a1578d4de3b45a917ec929f602.pdf
    • https://static.usrfiles.com/ugd/b8c837_a86cc98d60f048a99d863c5b6d6b8d42.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0825/files/popebe.pdf
    • https://cdn.shopify.com/s/files/1/0427/8062/3015/files/wiradokijozusax.pdf
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/fokorogubixu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/lebovamigojomudaxapi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/the_ontological_argument_st_anselm.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_off00006ca0.bin
43173cd833cb9992ca77911f8cbe78e71a4af65e67832a99d54b16042a7ed885
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA0 5352 bytes
font_01_sfnt_off00007ecc.bin
1de7992c7cb222177f94af2d0ee68647a212d601d3ed4beb4eab3a73f425fa5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ECC 9852 bytes