Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef053d1d9673f36…

MALICIOUS

PDF

66.7 KB Created: 2020-08-12 15:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9481a71ad689c8b49d92c5631fd8337 SHA-1: 905445b9476f174d5a128913bd201f3a76020b7b SHA-256: 4ef053d1d9673f362d58d53fd2d6b3d2de1e2892663d3acc15f4921d469c6be0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=finite+element+plasticity+and+metal+forming+analysis+pdf'. This URL is likely part of a link farm designed to obscure the true destination. The document body, though heavily obfuscated, also contains this URL, reinforcing its malicious intent. The presence of numerous other unknown URLs further suggests a distribution mechanism for 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.ru/pify?keyword=finite+element+plasticity+and+metal+forming+analysis+pdf
    • http://zufakef.tianashores.com/uploads/1/3/1/4/131453215/xoruniw-zaninetikoxug-liwakidevodor.pdf
    • http://jones.divinedesigning.com/uploads/1/3/1/0/131070306/14510a85e4.pdf
    • http://pupeve.corkscreworders.com/uploads/1/3/0/7/130740019/sasunivedenuzota.pdf
    • http://fibanaruj.timwilt.com/uploads/1/3/1/3/131383791/zutabuserofoji.pdf
    • http://nixorar.skycreekaussies.com/uploads/1/3/1/6/131636903/xusiwawuvowo.pdf
    • http://pupeve.co
    • https://cdn.shopify.com/s/files/1/0433/5756/9176/files/64594753861.pdf
    • https://cdn.shopify.com/s/files/1/0432/8020/3944/files/hitachi_tv_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/impressed_current_cathodic_protection.pdf
    • https://cdn.shopify.com/s/files/1/0435/9464/5672/files/42378338974.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34007792176.pdf
    • https://cdn.shopify.com/s/files/1/0437/6412/1749/files/jinasewitaguzafiten.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/jeruziketasetipaguvororek.pdf
    • https://cdn.shopify.com/s/files/1/0437/1965/5579/files/56538567720.pdf
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/renatafuxuregitebe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7137/files/tangled_the_series_season_2_episode_16.pdf
    • https://cdn.shopify.com/s/files/1/0450/6569/9478/files/java_foundations_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/0081/6028/files/miscreated_host_server.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_off0000bb36.bin
f742bcec36cdc4f70e215c66da579dfe20eea4436667ba6a4b115e0d347eddb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB36 5532 bytes
font_01_sfnt_off0000cdf0.bin
52a23694e2b3e88afe4d4971f5441c59bcdfcc2ab42fe9a91473a520abb9e0f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF0 14232 bytes

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