Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a01336e1f32b5f…

MALICIOUS

PDF

45.6 KB Created: 2020-07-10 12:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 1f5e14acf22ae3b68423e17405e07383 SHA-1: cd28b32656edc83560e0e3477beb994041c87912 SHA-256: b2a01336e1f32b5f4595b1002c65430e1026a55bcd8a7e536f3aa3d2ff4c6eac
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which point to domains associated with link farms and redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The document body, though partially corrupted, contains text related to 'Asymmetry book pdf' and the URLs, suggesting a lure to download a malicious PDF disguised as a book. No scripts were extracted from this sample.

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://ttraff.ru/wb?keyword=asymmetry%20book%20pdf In PDF document text
    • http://files.farmarcadia.com/uploads/1/3/0/9/130969242/dotasuwora_dazikuna_foxesajezasowa.pdfIn PDF document text
    • http://files.crunantucket.com/uploads/1/3/2/6/132680926/kumelovusufakexo.pdfIn PDF document text
    • http://files.jlongkandb.co.uk/uploads/1/3/1/6/131606368/da1337258866eff.pdfIn PDF document text
    • http://files.astablaksiberians.com/uploads/1/3/2/8/132814969/weduwapem_vedosorebezemib.pdfIn PDF document text
    • http://files.sports-journalism.com/uploads/1/3/0/7/130739926/vuvudafufutu-refedir.pdfIn PDF document text
    • http://files.glowmedica.com/uploads/1/3/1/3/131383283/6000948.pdfIn PDF document text
    • http://files.ordersretreat2020.org/uploads/1/3/1/4/131437823/3685399.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xevabutifun.files.wordpress.com/2020/06/vokimabiwujo.pdfIn PDF document text
    • https://zetafupoferu.files.wordpress.com/2020/07/24786282929.pdfIn PDF document text
    • https://gafupatuze.files.wordpress.com/2020/07/95656156876.pdfIn PDF document text
    • https://jevodoniweku954148245.files.wordpress.com/2020/06/buronoguzenewe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6219719719.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fufabolip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bojakotipizijogi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7641 4872 bytes
SHA-256: 661912f8ae8c02ae05a6460e93c66740d980c8a0cf78ad6b7729091e81f74a49
font_01_sfnt_off000086d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D2 10240 bytes
SHA-256: 9cca4be9edb8241cbef9ce862bd2480ee05b748f669f7c6cfed742da02be6849

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