Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf76372ff5c9f1a…

MALICIOUS

PDF

47.1 KB Created: 2020-08-11 07:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6631909f9cf667df23548862b3dc31a SHA-1: 1fa03a428d19570b14fdb91995b43723d78b25a4 SHA-256: ddf76372ff5c9f1a9cb79ff04c6250617eee807e6c9ccffbe8e16d0c09c1a19f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded URLs. One of these URLs, https://ttraff.ru/pify?keyword=l+aleph+borges+pdf+italiano, points to known malicious redirector infrastructure. The presence of a large link farm suggests an attempt to distribute malicious content or conduct phishing operations. No scripts were extracted, and the document body was heavily obfuscated.

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=l+aleph+borges+pdf+italiano
    • http://files.intrepidtricking.com/uploads/1/3/0/8/130873893/ralinijokadapupewer.pdf
    • http://files.manosrhodes.com/uploads/1/3/1/4/131437693/vibedudirode-kelemeki-salusekewamal-mojijebagawoj.pdf
    • http://files.beyondaspectrum.org/uploads/1/3/1/6/131607029/427ca9396557b.pdf
    • http://files.websitetemplatesdesign.com/uploads/1/3/0/9/130969297/kadixefuled-kivobotobaj-kepeburoxofoba-mamuwufor.pdf
    • https://cdn.shopify.com/s/files/1/0431/0099/5741/files/62264453863.pdf
    • https://cdn.shopify.com/s/files/1/0435/7813/0593/files/pikiwiliregikufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0985/8984/files/genobadifabal.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7283/files/fufewaninaku.pdf
    • https://cdn.shopify.com/s/files/1/0431/9700/5981/files/ronim.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/29814287707.pdf
    • https://cdn.shopify.com/s/files/1/0438/8506/8456/files/beludojikovenoxize.pdf
    • https://cdn.shopify.com/s/files/1/0428/7037/4566/files/zinalemafavapojevat.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/12627983692.pdf
    • https://cdn.shopify.com/s/files/1/0430/5738/1530/files/linfadenite_mesenterica_tratamento.pdf
    • https://cdn.shopify.com/s/files/1/0432/4383/1464/files/14397095653.pdf
    • https://cdn.shopify.com/s/files/1/0435/2727/4645/files/66650713928.pdf
    • https://cdn.shopify.com/s/files/1/0434/7461/6472/files/mogubepulidusurapoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1692/files/fatebujiluvavenijobaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/1884/4322/files/quimica_inorganica_atkins_4_ed_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000621c.bin
93b082469163625ce8a8939474d989fa6870797cf9ead886261612bce361d12a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x621C 5384 bytes
font_01_sfnt_off00007459.bin
4f921bd817b215a6570966b6b5d07d728daed098e28a1673b0ddadd259c605a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7459 10360 bytes
font_02_sfnt_off000097fa.bin
c668340ea348c6c31d5e51383644f9376ddb5abab10fc4a31907679951a3ddda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97FA 16208 bytes

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