Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9e63b5e0d8d7b4…

MALICIOUS

PDF

47.6 KB Created: 2020-07-31 21:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4b4ca3cfc70368ecf937207d4fac05f SHA-1: fd17b3d46425e53470e493508b69354aeaf04b9e SHA-256: ba9e63b5e0d8d7b42876125bdcfdd032f72bc5bae8346aa071be9c7917123781
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to URLs that are part of a large link farm, likely intended to manipulate search engine results or distribute further malicious content. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=heidi+przybyla+wikipedia
    • http://files.meatandpieco.com/uploads/1/3/2/8/132816202/rojosunukexivug.pdf
    • http://files.burghyart.com/uploads/1/3/1/8/131871772/vevelu.pdf
    • http://files.alissamittl.com/uploads/1/3/2/6/132681477/fawixedatozate_sexinikukivis_duposurod.pdf
    • http://files.keppelcoastcameraclub.com/uploads/1/3/2/6/132695416/6189204.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5830/files/fekaxip.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/poved.pdf
    • https://cdn.shopify.com/s/files/1/0429/1624/9767/files/fegetuvaxenimipage.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/13742567086.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/86211910370.pdf
    • https://cdn.shopify.com/s/files/1/0433/9548/1750/files/67048951249.pdf
    • https://cdn.shopify.com/s/files/1/0433/7244/5846/files/xevelipapuzof.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/luxasisubivesexe.pdf
    • https://cdn.shopify.com/s/files/1/0434/2674/2421/files/lomububovavufilagurew.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/pikolixu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2780/7911/files/6482131779.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/89254451101.pdf
    • https://cdn.shopify.com/s/files/1/0432/0506/6913/files/votesorugamagig.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_off00006ddc.bin
aa835463b61c0345e8cf03226f709fa347dc2630ac51bd78f2a56e6c4f626ffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDC 4676 bytes
font_01_sfnt_off00007dd7.bin
56e4f4280c5435ccc342f556561262fdd25413fd3c39375151167174f0c80db5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD7 10816 bytes
font_02_sfnt_off0000a2d7.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2D7 4324 bytes

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