Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21fac967109d187…

MALICIOUS

PDF

54.0 KB Created: 2020-10-03 20:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e2d7b30f4abe0553e9bf0f291cb36585 SHA-1: 10bf4a35fb223ee41934002eea10e646df28041d SHA-256: e21fac967109d1871527b0f653d914af8b62b7ba1bac413cbac6ab9362e06413
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded URLs suggest a malicious intent to redirect users or manipulate search engine results.

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://cctraff.ru/pify?keyword=candyland+board+game+online+with+friends In PDF document text
    • http://files.woodcaliber.com/uploads/1/3/0/7/130775286/moxoxegogavanu.pdfIn PDF document text
    • http://files.ndpharmabiotech.net/uploads/1/3/2/7/132712413/7424128.pdfIn PDF document text
    • http://vagurawu.dianedailydose.com/uploads/1/3/1/0/131071258/e2bb8df.pdfIn PDF document text
    • http://files.lessons-by-alex.com/uploads/1/3/0/7/130775063/genupaxeju-zoxefejinezuvo-gezepabafelar-kifikiji.pdfIn PDF document text
    • http://files.inibus.co/uploads/1/3/2/8/132814343/3681839.pdfIn PDF document text
    • http://joxega.acpamint.com/uploads/1/3/1/3/131379706/paporawotopagaru.pdfIn PDF document text
    • http://files.ovabc.org/uploads/1/3/1/4/131437683/5139115.pdfIn PDF document text
    • http://voruba.cityhighruns.com/uploads/1/3/1/4/131406592/6240100.pdfIn PDF document text
    • http://files.hallenelaw.com/uploads/1/3/0/8/130815009/4d0e33786d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/theology_of_the_body_explained.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2120/4631/files/pokemon_sword_and_shield_strategy_guide_release_date.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8365/3527/files/82310766003.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4922/0256/files/xijeza.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_off000094c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94C3 5560 bytes
SHA-256: cec0d5d61eb96d1d549cd2565df07eb66823bb5baca88acf30109fe3afd3d265
font_01_sfnt_off0000a793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA793 10372 bytes
SHA-256: 557e8da8060ecda5817370f43d18f2349f3d1217ea6dcf4ac72895e4048233ad

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