Malicious PDF — malware analysis report

Static analysis result for SHA-256 eabebb1acc9a2b20…

MALICIOUS

PDF

33.9 KB Created: 2020-08-18 18:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29d97ac79bc5d9b1100245d962d8ff63 SHA-1: 684ae60e13e85e27defdceda85c6842bc8d80e7a SHA-256: eabebb1acc9a2b20638509e9468448f652edaf8b238a565c5c87403a7ff3b1df
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a piano sheet music download. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL that leads to a redirector. The presence of numerous external PDF links suggests a link farm used for SEO poisoning or distributing further malicious content.

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=conquest+of+paradise+piano+sheet+pdf
    • http://files.cherylaperkins.com/uploads/1/3/2/3/132302916/tadiwedezume_sabuzevomuni_lojatujakaj_wuwibasisafexu.pdf
    • http://files.kamagraoz.com/uploads/1/3/1/4/131482931/rikuno.pdf
    • http://kemuwub.jenkatz-buonincontro.com/uploads/1/3/1/1/131164250/banulaxe_xejasubo_jujiram_dexem.pdf
    • http://files.bfstrings.com/uploads/1/3/0/8/130814195/rekapo.pdf
    • https://cdn.shopify.com/s/files/1/0436/8446/2745/files/mupodojakelejiwaxepateme.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kewosa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/87900445592.pdf
    • https://cdn.shopify.com/s/files/1/0430/0685/3269/files/51033517680.pdf
    • https://cdn.shopify.com/s/files/1/0429/9148/5091/files/53037644172.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9736/files/66458183858.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/xoxelanedagugepof.pdf
    • https://cdn.shopify.com/s/files/1/0437/9449/7698/files/verbal_ability_questions_and_answers_for_gate.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/68636606622.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/cambridge_objective_first_certificate_teacher_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/7659/1509/files/16115195021.pdf
    • https://cdn.shopify.com/s/files/1/0434/7500/9696/files/algorithms_in_c_robert_sedgewick_part_5.pdf
    • https://cdn.shopify.com/s/files/1/0436/1306/1277/files/zatus.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048d1.bin
edd7f0533f4218b85ec4cde204a608ed602f551031919346cbaab3b3bc90cbbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48D1 5128 bytes
font_01_sfnt_off00005a36.bin
b47d7c39cdd5ec1add035b81a3da022a4879dbc17ddb304f5f766d31d450abcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A36 9456 bytes

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