Malicious PDF — malware analysis report

Static analysis result for SHA-256 701fdc2f2f14964e…

MALICIOUS

PDF

38.6 KB Created: 2020-08-08 00:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c16c9d23af102cbcbb2c656251aa86e9 SHA-1: c63a31e4a8ad5b01080c5546d979221bfbb2a4ea SHA-256: 701fdc2f2f14964e26cdb0a951f13cd63e4b4bfacd93ccf6e61450b0af39002c
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL that is associated with malicious activity, and it also hosts a large number of external PDF links, suggesting a link farm for SEO manipulation. The document body and embedded links indicate a lure to download more PDFs, likely to distribute malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=american+academy+of+ophthalmology+books+pdf+free+download
    • http://files.dennstedtstem.org/uploads/1/3/1/3/131379991/gunuzateni.pdf
    • http://makefuva.nocofoodincubator.com/uploads/1/3/0/8/130814328/789740.pdf
    • http://files.newkensingtonpsumetz.com/uploads/1/3/2/6/132682167/09cd5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/0985/9999/files/zekisumerigowuzibad.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/walter_benjamin.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/delidupupukomojik.pdf
    • https://cdn.shopify.com/s/files/1/0434/3991/5164/files/28035060963.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8894/files/44517839170.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/45284124678.pdf
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/55622586435.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/freeman_biological_science_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/189771081.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27392185694.pdf
    • https://cdn.shopify.com/s/files/1/0433/4724/7263/files/kukoxedezufakuxa.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a5f.bin
8fc3f92e5166e1e75287d47859f62c83e651679fe7d1ce61f87d9aeeb9c78427		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A5F 5744 bytes
font_01_sfnt_off00005dcb.bin
89096572773790cd5b8d82b03bd8221838fbbc46af2fb5d1edff68f8a20ebaff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCB 9712 bytes
font_02_sfnt_off00007f1c.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1C 4324 bytes

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