Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6cc18c8686ee21…

MALICIOUS

PDF

44.6 KB Created: 2020-08-18 23:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b83042312b8e29ea43ac9454aa94284 SHA-1: 07fa8a051efe88ee9f69a2391d405ba119f689d7 SHA-256: 3c6cc18c8686ee21b5f9428b8c168b1200de45fa9df3b7ab8b4356cdeb87772c
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a malicious redirector link. The ML classifier also strongly flagged this PDF as malicious. The embedded URL 'https://ttraff.ru/pify?keyword=chatal+band+dj++2018+naa' is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting a link farm or redirection scheme. No scripts were extracted, but the presence of the malicious URL is sufficient evidence of malicious intent.

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=chatal+band+dj++2018+naa
    • http://files.simplygoatsmilk.com/uploads/1/3/2/6/132695575/zufuzaw.pdf
    • http://kinafo.avarmsbooks.com/uploads/1/3/0/8/130813528/gugutexanovuxawewum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40814320730.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vitalifurefafimeribedewo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1854/2504/files/pf_withdrawal_form_10c.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/sixagoropenenewagaxelo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/badorepuwubatusibeko.pdf
    • https://cdn.shopify.com/s/files/1/0434/1491/3191/files/wondershare_editor_ocr_serial.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/using_social_media_in_the_workplace_to_communicate.pdf
    • https://cdn.shopify.com/s/files/1/0429/6232/1567/files/medicare_item_numbers_cheat_sheet_2017.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/islamic_art_geometric_design.pdf
    • https://cdn.shopify.com/s/files/1/0440/5549/4806/files/atomic_structure_notes_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1607/files/88353618523.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/93208443910.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_off0000585d.bin
7ec69047d9301584db6b143ed29a28ae47e0931c0fe8e52bfd8b7ee00fbc0b45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x585D 4908 bytes
font_01_sfnt_off00006906.bin
aed5e0b3a6e3742d00cfbc27571e12067d78b4c319a93d46ff1c1864c0631dbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6906 14604 bytes
font_02_sfnt_off00009601.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9601 4324 bytes

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