Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ef1cd4edb43f7d…

MALICIOUS

PDF

44.6 KB Created: 2020-09-07 09:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9e6c410a090ba62d824d28ebd1ab32e0 SHA-1: bc7009ca3a317fdd9510fe2210ab366c8ce888ea SHA-256: b8ef1cd4edb43f7d3634a9be88ad63fa1e4839953b66fb782c2aff1f8f908d9b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.me/wix?keyword=game+pokemon+battle+fire+gba', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious infrastructure.

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=game+pokemon+battle+fire+gba In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7728/6565/files/flight_simulator_game_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/12572376107.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7527/0811/files/treatment_of_myocardial_infarction.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5951/9394/files/american_express_lounge_club_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1868/9434/files/imek_hrsz_2_trke_dublaj_izle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/magizokoluredofet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4748/3557/files/minecraft_if_power.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6517/2387/files/nujewosevugezuketokosovij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58143530911.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/19103d_5bdd6c4107c645a195fc08025853d67e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/49be48_c0474b1af70741db8e18aabc678b0c6a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/978dd5_9934d9e5213a4c18875a2bce902abcb0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/086daf_29b04f17fa9643428ed4ccc7aa1a2f49.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_0ef0b7b5cfa94282a8fa342ea28f6974.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9542/5191/files/concur_travel_training_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/36053234850.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8556/8923/files/letarajesijarirame.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEE 5276 bytes
SHA-256: e0939cca33a3575340f75745949feacc5fc8b2f3380c594abfafbdad50b86477
font_01_sfnt_off00007ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED6 10756 bytes
SHA-256: 853e4f66c28ac6c77ad96b558e1fbe310059e845f1dd2098ef94c76166e71973

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