Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e8c56710548512…

MALICIOUS

PDF

45.2 KB Created: 2020-08-22 21:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19b0dfccb3014b1fca294c9d7d2595a8 SHA-1: 9218fc4cd78d40316ba2a7c0ac41965e05d2591f SHA-256: 24e8c567105485127b5c3850a817c2c062a68665919f88fca9bc6ee4c4c17bd1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=factoring+perfect+square+trinomial+questions+and+answers', which is flagged as a malicious redirector. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm or SEO manipulation tactic, potentially leading to malicious content distribution.

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.com/pify?keyword=factoring+perfect+square+trinomial+questions+and+answers
    • http://files.tallsprucefarm.com/uploads/1/3/2/8/132815008/rapatexod-dobidopoxiwave.pdf
    • http://files.monica-raymond.com/uploads/1/3/1/3/131381540/1395282.pdf
    • http://zapop.winningmentalitygroup.com/uploads/1/3/0/7/130740206/zuseged_rogiguvuxod_pupekolodugulum_regaka.pdf
    • http://bujejezum.arctictreasures.shop/uploads/1/3/2/6/132682878/lumirakijow.pdf
    • https://cdn.shopify.com/s/files/1/0432/4543/7083/files/l_glucose_chair_conformation.pdf
    • https://cdn.shopify.com/s/files/1/0430/0950/7487/files/27182923906.pdf
    • https://cdn.shopify.com/s/files/1/0440/7712/1686/files/research_assistant_resume.pdf
    • https://cdn.shopify.com/s/files/1/0460/0781/2257/files/kenting_national_park_travel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/4188/1253/files/25337278180.pdf
    • https://cdn.shopify.com/s/files/1/0430/9375/4009/files/jedenepumigijezu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9124/7779/files/free_download_speak_english_like_an_american.pdf
    • https://cdn.shopify.com/s/files/1/0432/4913/9880/files/45463920775.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/green_river_wyoming_fly_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/9767/6192/files/boingo_tv_app.pdf
    • https://cdn.shopify.com/s/files/1/0430/7520/7322/files/avionics_certification_test_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6250/files/list_of_occupational_diseases.pdf
    • https://cdn.shopify.com/s/files/1/0436/1325/7885/files/83172007778.pdf
    • https://cdn.shopify.com/s/files/1/0433/4321/6789/files/nafedu.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_off00006704.bin
b71ab76744c9c396aa3bce8c1ee584a88543cb0ac34e35967cb167035c448c3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6704 5648 bytes
font_01_sfnt_off00007a31.bin
088d74800e7f9f283c3f43ce06b04ef661cbc62ddcb62f75718458623d948331		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A31 14212 bytes

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