Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71100b9cdd93a87…

MALICIOUS

PDF

44.3 KB Created: 2020-07-08 20:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27df28487ffe0d1b6212bdc63a8be90e SHA-1: ade7f3b29640a1dc796d4832ec4c07558bc89d2b SHA-256: b71100b9cdd93a87654333145f9861fe9a03a68282a8b64b28d76eb4297f8bed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a deceptive lure to 'join 2 pdf online' which, upon clicking, redirects to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the presence of numerous SEO-optimized PDF links further supports a malicious intent, likely for traffic distribution or phishing. No scripts were extracted from this sample.

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/wb?keyword=join%202%20pdf%20online
    • http://files.4arrowsoutdoors.com/uploads/1/3/0/8/130814672/1910526.pdf
    • http://files.thinkanomalous.com/uploads/1/3/2/7/132710787/nejugo_fetaxen_vijixer_nujogutoninuj.pdf
    • http://files.paiboon.biz/uploads/1/3/1/4/131406762/1208977.pdf
    • http://files.albumineetcollodion.com/uploads/1/3/1/6/131606353/3663787.pdf
    • http://files.cffu.org/uploads/1/3/2/6/132683111/bazakekukaxatiwi.pdf
    • http://files.basstabernaclecme.com/uploads/1/3/1/3/131380158/vunigutenenemaj_juvuwazesenupes_fenulaxirupida_lexavem.pdf
    • http://files.imarsonline.com/uploads/1/3/1/3/131380413/6c76ebc2.pdf
    • http://files.niassestudios.com/uploads/1/3/0/8/130874318/b919e96e4ba.pdf
    • http://files.metalmeltdown.com/uploads/1/3/0/7/130775755/36f932b68a.pdf
    • http://files.stokessolar.com/uploads/1/3/0/8/130874458/fuwapuv_fofub_zitob_legojunokozev.pdf
    • http://files.ambleon.net/uploads/1/3/1/0/131070125/zulalusimutolosu.pdf
    • http://files.makwawamalawi.com/uploads/1/3/2/7/132740860/zuder.pdf
    • https://fizosiximog.files.wordpress.com/2020/07/57043749222.pdf
    • https://gexuvuxaxuru.files.wordpress.com/2020/07/41306668525.pdf
    • https://mikurisem.files.wordpress.com/2020/07/dazari.pdf
    • https://zufarosivalu.files.wordpress.com/2020/07/visoxad.pdf
    • https://mewowubo.files.wordpress.com/2020/06/xosovulagapi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13139855908.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lugapib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zosakasebiribo.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_off00005bb6.bin
7af53f19cae7c40e7008cd5f444e4c5cfb4e772d8fbffbf4f224a674dc5e0596		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB6 4380 bytes
font_01_sfnt_off00006aa1.bin
600eed7befdf52c7abe939203b1ebce67d79e62b0b2b4271bc461e8523b0a919		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA1 10680 bytes
font_02_sfnt_off00008f12.bin
3088de61ba4d2b01ab234d84e40a42107c4d30a52b1b9bdaf8961d49da71d313		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F12 16076 bytes

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