Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fe715515a417e7…

MALICIOUS

PDF

51.7 KB Created: 2020-09-02 13:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1c9f57bedcb2453a2358b6195121327 SHA-1: 77b988b1048528aa541f9f53ef62da7c35a8cb5b SHA-256: 73fe715515a417e78da6fd0d5db29001299029f176a968e5981b207600cf2e45
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to a redirector service that is known to host malicious content. The document body, though heavily obfuscated, contains text related to loan agreements and a URL that appears to be the primary lure. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector link confirms the intent to lead the user to a harmful site.

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.club/wix?keyword=simple+loan+agreement+template+canada
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8438/1350/files/hal_higdon_half_marathon_training_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9509/files/low_pressure_boiler_water_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/kawakozafaru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9658/8967/files/the_animator_s_survival_kit_richard_williams.pdf
    • https://cdn.shopify.com/s/files/1/0433/9289/3095/files/wuwemukemekekep.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/78111700280.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/termin_absagen_muster.pdf
    • https://cdn.shopify.com/s/files/1/0437/5019/5354/files/beading_patterns_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0429/2630/9543/files/vazowuzuridubameguwu.pdf
    • https://static.usrfiles.com/ugd/e73fea_2c25a369965746fba33b6dc81156e433.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_3f07ef11d20f497d9c29c0118af6c532.pdf
    • https://static.usrfiles.com/ugd/20d83a_a9d032b677d24ef0a84b56abcbd85eaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/dixep.pdf
    • https://cdn.shopify.com/s/files/1/0433/7795/0881/files/25120518569.pdf
    • https://cdn.shopify.com/s/files/1/0432/7863/1072/files/zuvatebijepolezesotir.pdf
    • https://cdn.shopify.com/s/files/1/0435/5650/3713/files/fodanejinanoxonizega.pdf
    • https://cdn.shopify.com/s/files/1/0439/9353/0526/files/maledaxuvafupeli.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_off00008b90.bin
26ebf8bb02483f14eccb25bc9fb6ea34ec286c7aa69ee469576d37043ff11576		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B90 5320 bytes
font_01_sfnt_off00009d87.bin
319bad0411e228729e01a1260aa6e392be1ed09d98c2074bea2f4ff9fe9fa8ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D87 10536 bytes

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