Malicious PDF — malware analysis report

Static analysis result for SHA-256 292e9c3d86db474e…

MALICIOUS

PDF

46.3 KB Created: 2020-08-12 22:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1111459632c4fb9ddb220ccd7ae1196c SHA-1: 1a9cc57faca0a6fd100f1d4b0063a2e826eb913b SHA-256: 292e9c3d86db474ebc2b9200e8f977b1cabb2c30494dae1ea7f06acfae571021
152 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains references to the same redirector URL and a large number of other URLs hosted on 'cdn.shopify.com', suggesting a link farm or SEO poisoning tactic. The primary attack pattern involves redirecting users to malicious sites, likely for further exploitation or phishing.

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=chinese+new+year+paper+cutting+templates+pdf
    • http://files.faithforher.com/uploads/1/3/1/6/131606260/xugepazu.pdf
    • http://nakibazo.macclesfieldpoolleague.com/uploads/1/3/1/8/131856177/sikowusupiwutox-mirifisatasukur-zekijogadizi-vujudop.pdf
    • http://files.littlefootbridges.com/uploads/1/3/0/7/130740517/tutikupipupobufu.pdf
    • http://files.publicschools305.org/uploads/1/3/0/7/130776875/kofusijigefuvo.pdf
    • http://files.houstonprimaryschool.com/uploads/1/3/1/3/131398253/067d284f2.pdf
    • https://cdn.shopify.com/s/files/1/0435/9975/7474/files/dakulejikekobagozuji.pdf
    • https://cdn.shopify.com/s/files/1/0434/9794/7300/files/cinderella_story_english.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4695/files/roaring_20s_font.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1081/files/61107103428.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3764/files/oblivion_horse_armor.pdf
    • https://cdn.shopify.com/s/files/1/0430/8143/3242/files/18392548221.pdf
    • https://cdn.shopify.com/s/files/1/0432/8675/7536/files/biodiversit_microbienne.pdf
    • https://cdn.shopify.com/s/files/1/0434/0701/6103/files/pevemore.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/gerugepuripemu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7677/1224/files/vozafir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0363/3051/files/67170052504.pdf
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/21167876364.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zugazad.pdf
    • https://cdn.shopify.com/s/files/1/0430/8733/1481/files/91999388545.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_off00006825.bin
5163093a53209138d1302314b76d9a84bbb22194ccd27daee35daceedb776d75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6825 5556 bytes
font_01_sfnt_off00007aee.bin
dc08430943456dec9fb581d7e0149552b3c924869e84c4d814f30464425d8114		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEE 10212 bytes
font_02_sfnt_off00009da3.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DA3 4324 bytes

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