Malicious PDF — malware analysis report

Static analysis result for SHA-256 102163efe4b60180…

MALICIOUS

PDF

40.5 KB Created: 2020-08-05 11:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a2da31d24ac1eda2854a62802a65807 SHA-1: 394ee9291a84448890e6183d86990051b0df21c7 SHA-256: 102163efe4b601806669d9473a078a69109afe7971eb02675ae9001275e94791
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=english+aptitude+test+questions+and+answers+pdf`. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially obfuscated, contains similar URLs, suggesting an attempt to lure users to malicious sites under the guise of providing test questions or other resources.

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=english+aptitude+test+questions+and+answers+pdf
    • http://files.nativetales.com/uploads/1/3/0/7/130775942/b90bae542e.pdf
    • http://files.vbgprofessionals.com/uploads/1/3/1/3/131398419/lilugolemukixig.pdf
    • http://suteli.knowlebadminton.com/uploads/1/3/0/8/130814017/lojezesurolinalukil.pdf
    • http://files.hecmaconference.org/uploads/1/3/0/7/130776795/9765255.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9956/2911/files/vekigawavawo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4614/1093/files/c_pointers_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/dixas.pdf
    • https://cdn.shopify.com/s/files/1/0433/4823/0297/files/motorola_sbg6580_login.pdf
    • https://cdn.shopify.com/s/files/1/0433/7542/7740/files/wireless-_n_wifi_repeater_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4016/files/zutixojukixibidewuxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zamujogeve.pdf
    • https://cdn.shopify.com/s/files/1/0431/7878/6965/files/70915460763.pdf
    • https://cdn.shopify.com/s/files/1/0435/1570/7551/files/67704229039.pdf
    • https://cdn.shopify.com/s/files/1/0437/5507/7781/files/macx_video_converter_pro.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/skyrim_vs_skyrim_special_edition_mods.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3307/files/susugizovarobusokatoz.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_off00005f4a.bin
1c91400f36fc32b1a173286f5fdd0f0b162652d77acc1f990b83af80043a13c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4A 5476 bytes
font_01_sfnt_off000071f7.bin
b0d46ef36637d1f4de4208374e99e919ae7eda971f27289b0928da2e974db779		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F7 10164 bytes

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