Malicious PDF — malware analysis report

Static analysis result for SHA-256 686d57fba350f6d1…

MALICIOUS

PDF

69.7 KB Created: 2020-08-24 19:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d270179ebb26823b56c3b254add916cc SHA-1: f33ca92f3dea91805c129c1803b8bd4c4fa06890 SHA-256: 686d57fba350f6d1be709538666fb2791db27878eba51ea531a512e7b3eae51f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector URL, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though partially obfuscated, includes the same URL and a reference to a music video, suggesting a lure. The PDF also hosts a link farm of 28 external PDF files, indicating a potential SEO poisoning or spamming campaign. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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=ain%2527+t+your+mama+official+music+video
    • http://fabutirig.stoneslifecoaching.com/uploads/1/3/1/4/131454165/jozudel.pdf
    • http://files.housefinchinvestors.com/uploads/1/3/2/6/132682787/relufat.pdf
    • http://files.laura-lyman.com/uploads/1/3/1/4/131438216/9658395.pdf
    • http://kowituk.reedcooper.net/uploads/1/3/1/0/131070718/dosekeweladajopu.pdf
    • http://files.metalmeltdown.com/uploads/1/3/0/7/130775755/36f932b68a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9671/0047/files/statistical_quality_control_el_grant.pdf
    • https://cdn.shopify.com/s/files/1/0438/5977/1557/files/manual_audifonos_bluetooth_sony_wi_c300.pdf
    • https://cdn.shopify.com/s/files/1/0432/1283/2931/files/libro_actos_de_fe_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0445/5186/4484/files/zuwojuresomekiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/4350/3783/files/janipotiduxalokono.pdf
    • https://cdn.shopify.com/s/files/1/0428/4517/5971/files/microsoft_update_session.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8548/files/16257764866.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/7996/files/60967792292.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0855/files/zufupebulujovanexo.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b303.bin
68f6a5931f37ff907be3e63d34b7ab635a06161d14bd8f5af55071a4e5c64361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB303 5352 bytes
font_01_sfnt_off0000c52d.bin
0148d84b656a1f0616c8a9dfc9981021be64b5a52434d0c4c5e3042014de986b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC52D 11108 bytes
font_02_sfnt_off0000ea04.bin
001d00114279cda904ec87ee5caf81ece5266ef333c342f0ca5ce216f4908131		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 18776 bytes

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