Malicious PDF — malware analysis report

Static analysis result for SHA-256 683a602e1da49c13…

MALICIOUS

PDF

38.6 KB Created: 2020-08-21 07:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee5f06f6b9ffa97810b2a21d18b61ba6 SHA-1: 96683722ec07477ff927e62bffcf9244106f1a8b SHA-256: 683a602e1da49c1370d62b2bac79d0b148d03d6c3cf1fc9a5b8e50418b5e0a45
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to a malicious site offering a modded APK. The primary malicious URL identified is https://ttraff.ru/pify?keyword=bricks+and+balls+mod+apk+revdl, which is flagged as a malicious redirector. The document body and embedded URLs suggest a lure for downloading potentially unwanted applications.

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=bricks+and+balls+mod+apk+revdl
    • http://xudabozin.agextonline.com/uploads/1/3/2/7/132740850/linirugizulame.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/lutewopetofodi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8605/2504/files/angry_birds_transformers_mod_apk_game.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/kekoma.pdf
    • https://cdn.shopify.com/s/files/1/0434/2435/0375/files/dictionary_app_sinhala_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9202/files/77165590374.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/11531298390.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9833/files/ends_and_means_aldous_huxley.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/nodawanidadufukoretebudup.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0020/files/71473935901.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000588d.bin
824fa6394e448736d087ea8c76d29015fec5f6b0ea6cbac50befdcb93349dcb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x588D 5532 bytes
font_01_sfnt_off00006b43.bin
c62a96ab0e011e44e45d024a71c700af558f8c4a5ba70260a2d859c9e2cd4fe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B43 10088 bytes

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