Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91c128128cfdded…

MALICIOUS

PDF

43.3 KB Created: 2020-10-01 13:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e38c25fd3bf0c9495d72ecb5b4348839 SHA-1: 64326902f30d0c13f5d6ae1edc77850a43b162f5 SHA-256: d91c128128cfddedbb928d32b4ca85bbbac0b2899a84e26d53ce282b73ac04c8
184 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to disposable hosting and redirectors, indicating a link farm designed to distribute malicious content. The primary redirector URL is https://cctraff.ru/strik?keyword=e+rickshaw+battery+charger+circuit+diagram+pdf, which is flagged as malicious. The ML classifier also strongly indicated maliciousness.

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/strik?keyword=e+rickshaw+battery+charger+circuit+diagram+pdf In PDF document text
    • https://site-1037156.mozfiles.com/files/1037156/37408480866.pdfIn PDF document text
    • https://site-1036988.mozfiles.com/files/1036988/legofotivikosimuxivo.pdfIn PDF document text
    • https://site-1036754.mozfiles.com/files/1036754/99366621400.pdfIn PDF document text
    • https://site-1037018.mozfiles.com/files/1037018/finaput.pdfIn PDF document text
    • https://site-1036819.mozfiles.com/files/1036819/zufemomiwiwovivudonuj.pdfIn PDF document text
    • http://fazujobot.kimoraleigh.com/uploads/1/3/1/3/131383482/pujimevopokumo.pdfIn PDF document text
    • http://files.helena-yang.com/uploads/1/3/1/4/131437443/begolipajeguf_jononevu.pdfIn PDF document text
    • http://files.sophiehacker.com/uploads/1/3/1/0/131071262/54b17c4858913.pdfIn PDF document text
    • http://files.assiniboiakinettes.com/uploads/1/3/1/4/131452952/firoz_gadoragamux_benapikibiru_mimugo.pdfIn PDF document text
    • http://files.belladesgagnes.com/uploads/1/3/0/8/130874524/wotat.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/f81cad38-64f3-405e-ad1e-afa511f7c8dd/razijoparaberasezig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/959c8243-6485-4eb6-9409-fd6e4e5651cd/54712747982.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/mopesotegoka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8063/7861/files/bed_bath_and_beyond_college_apartment_list.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68EB 5892 bytes
SHA-256: 5f13b4e483f1b4aabf3c6573c64cce050e163ca2a60e4678b59bc32169744ebe
font_01_sfnt_off00007cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEA 10120 bytes
SHA-256: 0e32b729cdf51e8736f1b61e4fbf1040dc0f85f4812d3ea2bc8ae8ca4f6f3710

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