Malicious PDF — malware analysis report

Static analysis result for SHA-256 370705aa466296f4…

MALICIOUS

PDF

53.2 KB Created: 2020-10-07 07:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 89c46b754e4c2fce1d495cbd25fde6ae SHA-1: 73fd20f8377b4dbaa3fdf9948243e2dc3ca8215d SHA-256: 370705aa466296f4a525eb43b5d5e6632573af69e5fffd9933eb058928740c26
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to link farms hosted on disposable domains, indicating a likely SEO poisoning or phishing campaign. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document body contains a URL that matches one of the identified IOCs.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/pify?keyword=raoult%25E2%2580%2599s+law+is+not+valid+in In PDF document text
    • http://pejarad.elvikam.pl/uploads/1/3/0/8/130814328/6629429.pdfIn PDF document text
    • http://files.stephens.org.uk/uploads/1/3/1/3/131379034/5b1d728b3.pdfIn PDF document text
    • http://ripowibir.officeformations.com/uploads/1/3/0/7/130776262/pikegonajekini-fejasesopawo-xekamifivewiso-tujofozoko.pdfIn PDF document text
    • http://files.nmbconferencetrips.com/uploads/1/3/1/3/131383860/mokopekixupududaz.pdfIn PDF document text
    • http://files.brandonroberteck.com/uploads/1/3/1/8/131856917/8d3d29532243c.pdfIn PDF document text
    • http://vavure.royalhouseofstyle.com/uploads/1/3/1/0/131071063/0de0a26caf286e.pdfIn PDF document text
    • http://files.sirkil.com/uploads/1/3/0/8/130814596/pobopes_jatafu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1760e99f-e0e9-4ec6-bc9f-c005ccf04d6c/6526612474.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5875/2405/files/susano_guide_ffxiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/pyromancy_dark_souls.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/kafarono.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000736e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x736E 4932 bytes
SHA-256: 4953787f6c12258e7735a778a6af2eb27bd73aa4cf5718a45c0966726c41553c
font_01_sfnt_off00008470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8470 13836 bytes
SHA-256: f80ecd4d309157741e9c13b7aabd6a39ae324a4a3b0db8b12101dd7f423483dd
font_02_sfnt_off0000afd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD7 16396 bytes
SHA-256: 48545192e53b3a4e6507176fe0dcaaadb6bd6d68b8c5fa17494e7ca75ca1e299

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