Malicious PDF — malware analysis report

Static analysis result for SHA-256 14458f5fcf6f8b0c…

MALICIOUS

PDF

53.1 KB Created: 2020-08-10 10:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a39399def7767d979046dffc20df40f9 SHA-1: f3b86339ad4a05f39f8ed6d4c64f37b9bdc2dadd SHA-256: 14458f5fcf6f8b0c20854060cec34fdef5e78c09491f967d78ffa3303c0351ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, likely to drive traffic to malicious sites or for SEO spam. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.ru/pify?keyword=staphylococcus+aureus+coagulase+positive+pdf
    • http://dovep.leanderboatclubofhamilton.com/uploads/1/3/0/7/130776611/mugig_bojoxe_nodejerut.pdf
    • http://likivaxu.majesty-lounge.com/uploads/1/3/1/8/131856333/soxinuwoxi-vamonofesuzaw-jipudosekonamop-jedugewugafebeb.pdf
    • http://files.mrandmmeb.com/uploads/1/3/0/9/130969235/gorexoxifefopaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/kodogalabav.pdf
    • https://cdn.shopify.com/s/files/1/0436/0372/2398/files/wegekunodaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/1994/3579/files/kbh_games_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/6578/3958/files/carrier_chiller_19xr_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/9861/0589/files/80878068417.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/lebugazuzase.pdf
    • https://cdn.shopify.com/s/files/1/0437/8034/1917/files/madukuwonimaripemane.pdf
    • https://cdn.shopify.com/s/files/1/0429/4751/0435/files/acls_course_material.pdf
    • https://cdn.shopify.com/s/files/1/0430/6255/8874/files/28158655236.pdf
    • https://cdn.shopify.com/s/files/1/0433/0160/1444/files/50102226821.pdf
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/bofabagivukugi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6459/7397/files/auto_tune_plugins.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_off000083db.bin
21ecdd91f41dbb66d9e44310a06c291e5ac9e0f33998cfe19eeb43e82545f66c
pdf-font-stream PDF embedded font (sfnt) at offset 0x83DB 5684 bytes
font_01_sfnt_off0000973e.bin
b38116909b5c8994383dd71ffac069625b8060dcfd9afd72e3c73ba367035fd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x973E 15236 bytes