Malicious PDF — malware analysis report

Static analysis result for SHA-256 255b6a838ff9d836…

MALICIOUS

PDF

52.1 KB Created: 2020-08-03 19:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e33a34d3f34aa43cadbf8998d0d1f18 SHA-1: 1cbb42f678d6f52a62b5681d619834981ff90f51 SHA-256: 255b6a838ff9d836ddab383c8880dca9cd88a51ff1fa0cb97be371f388914187
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text related to 'scales and arpeggios sheet music pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. 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.ru/pify?keyword=scales+and+arpeggios+sheet+music+pdf
    • http://files.mtel.rocks/uploads/1/3/1/8/131857734/8956467.pdf
    • http://files.foodsfourthought.com/uploads/1/3/0/8/130874110/4cd601bc4e.pdf
    • http://files.belnacandlecompany.com/uploads/1/3/2/6/132695455/3469644.pdf
    • http://files.ogkquote.com/uploads/1/3/1/4/131482962/xasunazodibikebob.pdf
    • https://cdn.shopify.com/s/files/1/0438/2215/3890/files/35768364298.pdf
    • https://cdn.shopify.com/s/files/1/0429/6058/4870/files/30071701859.pdf
    • https://cdn.shopify.com/s/files/1/0432/5788/8936/files/58088701729.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/50351768002.pdf
    • https://cdn.shopify.com/s/files/1/0428/6588/5351/files/21053847050.pdf
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/dulenopavulofokip.pdf
    • https://cdn.shopify.com/s/files/1/0435/3681/0135/files/80418832693.pdf
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/vironet.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/27721569060.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8268/files/29920269658.pdf
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/rijumixafuvumusolovutiva.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/nesije.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rapuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48466687054.pdf
    • https://cdn.shopify.com/s/files/1/0435/5814/2120/files/94643828389.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_off00008c65.bin
df6c96c94a349ce9d25851355032535dc1a3a9349efc9797118381a4e4ac180b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C65 5672 bytes
font_01_sfnt_off00009f83.bin
4efc258b3adb3c6c930ce31f4591a06506863ee69ea9964d425b33b7a4bdd597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F83 10376 bytes

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