Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b7a56d44ba886f…

MALICIOUS

PDF

51.3 KB Created: 2020-08-08 07:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e62dc2937fb78691a8c0cf05d52f3251 SHA-1: 3618d5c466800267b2d0e4b58722e8ab23cee78e SHA-256: f8b7a56d44ba886f8b0709f69f51f696fb8ab64c2c5b9b418390b426c3963166
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=animal+parasitology+pdf', which is a known malicious redirector. This indicates the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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.ru/pify?keyword=animal+parasitology+pdf
    • http://gawuk.silvacontentsolutions.com/uploads/1/3/2/7/132740494/texapatut-xujupud.pdf
    • http://nuzodamo.williamsremodeling.com/uploads/1/3/1/4/131482975/jagovuwodes-ledos-wogerovupo-gizagasekusogak.pdf
    • http://files.thehearthgp.com/uploads/1/3/0/9/130969356/2823295.pdf
    • https://cdn.shopify.com/s/files/1/0436/2053/2386/files/62423330927.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/17321953595.pdf
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/basics_of_computer_applications.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kafojisiguzisov.pdf
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/4126871419.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2113/files/rapekirabazuwawiki.pdf
    • https://cdn.shopify.com/s/files/1/0434/4571/5109/files/interstitial_lung_disease_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0428/4930/4742/files/tabufebasuvejusawitaxewab.pdf
    • https://cdn.shopify.com/s/files/1/0433/9898/7941/files/71129358360.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/tactics_for_toeic_listening_and_reading_test_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20931566490.pdf
    • https://cdn.shopify.com/s/files/1/0440/3838/9925/files/arabic_alphabet_with_pronunciation.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7914/files/nejewedinitovaxemikupavi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9541/7237/files/25258071231.pdf
    • https://cdn.shopify.com/s/files/1/0437/0061/7381/files/lixitos.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089e6.bin
604441e2e23abb46953165094e4bc0b19406001ac0425425391404cb832f5467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89E6 5452 bytes
font_01_sfnt_off00009c5f.bin
ea8ec5addec962b3d66be728fe49a5fb04da406a8f8358706a17146f185d05fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C5F 10752 bytes

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