Malicious PDF — malware analysis report

Static analysis result for SHA-256 d168ea62f08539e0…

MALICIOUS

PDF

39.9 KB Created: 2020-08-12 14:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f20e1632e3cdb519f4707baace0e3d0 SHA-1: b5a2bbaf6f621eba00d21e4b599f968640fda775 SHA-256: d168ea62f08539e0496586454329dbdaae7d43220f489c6ab4fe03fd1be0a166
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as cancer information, which leads to a link farm of other PDFs. The ML classifier strongly indicates maliciousness. The primary malicious IOC is the redirector URL, which is used to funnel victims to further malicious content.

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.cc/pify?keyword=cancer+full+information+pdf
    • http://files.buffalolake.net/uploads/1/3/1/3/131398250/taleliropabo.pdf
    • http://files.graniteexpomn.com/uploads/1/3/0/7/130776745/7467427.pdf
    • http://revuv.kennethlwatersjr.com/uploads/1/3/0/7/130776485/xewerinozi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/18583874105.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3591/files/unfallbericht_schreiben_bung.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vufofabiziterefabul.pdf
    • https://cdn.shopify.com/s/files/1/0432/4071/8496/files/55712689796.pdf
    • https://cdn.shopify.com/s/files/1/0434/0563/9836/files/molecular_virology_book.pdf
    • https://cdn.shopify.com/s/files/1/0438/7956/3432/files/pdf_of_marketing_management_calicut_university.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/narujavotekofiguvin.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/xegebijudaro.pdf
    • https://cdn.shopify.com/s/files/1/0430/7602/6522/files/38055068497.pdf
    • https://cdn.shopify.com/s/files/1/0428/4225/9612/files/84990869880.pdf
    • https://cdn.shopify.com/s/files/1/0431/9834/9471/files/important_days_list_for_bank_exams.pdf
    • https://cdn.shopify.com/s/files/1/0433/7264/2454/files/cours_d_astronomie_pour_debutant.pdf
    • https://cdn.shopify.com/s/files/1/0439/9392/3742/files/cabac_cable_ties.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/79576648394.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051d8.bin
fd86b625759d8ef2383598e4e975058e68e5390198fac5da10070d7304b91d61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51D8 5028 bytes
font_01_sfnt_off000062d9.bin
328ca275e9f72b6228886c110d209a180905dc7ca4e559e5ccbfbe1b6e2f1e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D9 9876 bytes
font_02_sfnt_off000084a5.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A5 4324 bytes

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