Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbdd1b8251e8177…

MALICIOUS

PDF

41.0 KB Created: 2020-09-02 21:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ab575b51a50de5fefa4732e244f8c6a SHA-1: 3fac8ff9561e427a5872339906768792c44bb454 SHA-256: 6dbdd1b8251e8177eadf18587974c0d8a34355656720e98322196bf011b017c3
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.me/wix?keyword=fishing+osrs+f2p+guide, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and appears to be a lure related to an online game. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to distribute 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.me/wix?keyword=fishing+osrs+f2p+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/5438e3_ebc539a6dcff49e3a6106fc40859dfa1.pdf
    • https://static.usrfiles.com/ugd/60933b_cd7eceab19054ae3a38f33ec391ebe2b.pdf
    • https://static.usrfiles.com/ugd/0789d5_5db507856cab4f07a2d1faed9cec1d6a.pdf
    • https://static.usrfiles.com/ugd/930050_738eab3bb6a144d48340e624c012cee1.pdf
    • https://static.usrfiles.com/ugd/b41a9a_5b062e1c09b849ccbfd2d7ed2c129e93.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7461/files/root_checker_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0449/8876/0232/files/uspstf_guidelines_breast_cancer_screening.pdf
    • https://cdn.shopify.com/s/files/1/0436/7846/6201/files/after_effects_shortcut_keys_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/jatapizipabo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5062/2358/files/covey_matrix_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0430/6662/2101/files/kakinada_weather_report_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8827/1777/files/battle_cats_gao.pdf
    • https://cdn.shopify.com/s/files/1/0466/9122/1668/files/call_recorder_application_for_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/9405/6861/files/dilebukamev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10542261424.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/cancer_chemotherapy.pdf
    • https://cdn.shopify.com/s/files/1/0431/1947/6896/files/mp3skulls_download_app.pdf
    • https://cdn.shopify.com/s/files/1/0431/0450/1922/files/20132268643.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_off000063be.bin
24913a5d0c7d27163da7992237743ebec30ff2b327bdd6384456267b4770823e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BE 5148 bytes
font_01_sfnt_off00007546.bin
5c86b9eb22a310551f8ce7137a1654bd1a4531ab2c325424596a046b66a13f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7546 10024 bytes

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