Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8e28086c56ea39…

MALICIOUS

PDF

66.9 KB Created: 2020-08-09 16:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0f378e111dea342acdd930425d5a779 SHA-1: 2a0fcfc1592090dc39e66e4d82b26870f22872d9 SHA-256: ad8e28086c56ea3910cc19af7735e6a42a9eda7dc6f5b45a6530bf3e7d0cfb75
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=opposite+words+in+kannada+language+pdf, which is a known malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.cc/pify?keyword=opposite+words+in+kannada+language+pdf
    • http://bibozakar.classyhippieteaco.com/uploads/1/3/1/8/131857631/e54e119.pdf
    • http://files.sustainableartschool.org/uploads/1/3/1/8/131856987/f2d99.pdf
    • http://files.chameliramachandran.com/uploads/1/3/0/7/130776518/kisanumujexovudimo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7866/4867/files/44697913807.pdf
    • https://cdn.shopify.com/s/files/1/0434/3991/5164/files/waec_technical_drawing_past_questions.pdf
    • https://cdn.shopify.com/s/files/1/0428/3305/1814/files/36242604270.pdf
    • https://cdn.shopify.com/s/files/1/0436/4887/6702/files/visuwuduwokidiwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/the_traders_blueprint_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/1283/1907/files/bazibizawafadebofivugi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0954/6136/files/70878394073.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/turopasufero.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1695/files/nodaremopot.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0464/files/the_blacker_the_berry_novel.pdf
    • https://cdn.shopify.com/s/files/1/0435/7849/1041/files/jipebivejilaralaxeveti.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 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_010_off0000c406.bin
b22710da0d81dd36a81e8e78bcecf4ea7c2753a5b0ec201b4feebcf02f812944		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC406 18176 bytes
font_00_sfnt_off0000468d.bin
5bc0c613ba44bb21ddd0165c472b04bd8a7a46ec8e3c6dee90c43d2f119ed49d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x468D 5588 bytes
font_01_sfnt_off00005a1d.bin
6126fa1a6b26dd4aafda8dede6176bd3ed9784fa7ac4304ef8de6b462f791ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A1D 5272 bytes
font_02_sfnt_off00006c28.bin
ff8289fcab20b7b81f5dc7c47458689637225d7099c48932a46d6898d6123f6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C28 2656 bytes
font_03_sfnt_off0000772f.bin
18b250f24057ce91e4a59b25c1eec79fa8b4d7e2cb9f6c0de02c7e032a072fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x772F 2328 bytes
font_04_sfnt_off000081e4.bin
5fc9e2cd4e7ad04544edda2023dd698132b65daf167a61e09de9fd8de66d8b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E4 2108 bytes
font_05_sfnt_off00008baf.bin
593a452f0795506ac97007ad32b21767cc543cb1bc716fd74108abb5279d52e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAF 6640 bytes
font_06_sfnt_off00009d4d.bin
d0b4de94ae06d49442f1be3533488f2367ec6405d79f8673de8aff0d68a63018		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D4D 11452 bytes
font_08_sfnt_off0000e096.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE096 4324 bytes
font_09_sfnt_off0000ee96.bin
36e71c95d3b6602ce175a98ac99a2c18c99235fab0e24c6c46ec4ff9e72f8c94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 3276 bytes

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