Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e1d8cd222711a4…

MALICIOUS

PDF

42.2 KB Created: 2020-07-22 08:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59c571b215f255db90e0e3173cc60e45 SHA-1: 59d18d160bcfc78777e931001ca87f977b6c2225 SHA-256: 68e1d8cd222711a46da18aba2482a51a6999a65a1719002a0e2fd759a3c4ad30
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating a likely attempt to manipulate search engine results or phish users. The embedded URLs, while many are benign, point to a broader infrastructure designed to host numerous PDF files. The ML classifier strongly flagged this PDF as malicious.

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=expanding%20and%20simplifying%20algebraic%20expressions%20worksheet%20pdf
    • http://files.scarboroughlodge.co.uk/uploads/1/3/2/6/132681033/1707088.pdf
    • http://files.authorcharityayres.com/uploads/1/3/1/6/131606169/ca7cbb.pdf
    • http://files.sportsimagephoto.com/uploads/1/3/1/8/131871633/74724068aa6eee.pdf
    • http://files.pawsomewalksnj.com/uploads/1/3/1/4/131453602/juwizidopixup.pdf
    • http://files.jacquelinesalvador.com/uploads/1/3/1/4/131453402/2fc7ac52ad1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/lewojepidozimobegut.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/mudivinotedis.pdf
    • https://cdn.shopify.com/s/files/1/0429/2011/6380/files/75365854023.pdf
    • https://cdn.shopify.com/s/files/1/0432/8488/9758/files/58186581622.pdf
    • https://morumekifos.files.wordpress.com/2020/07/542794147.pdf
    • https://wivobajet.files.wordpress.com/2020/07/gafabatujawup.pdf
    • https://sigegajif.files.wordpress.com/2020/06/zisagebikivof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/xeveniw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84511803825.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/davegamakuvobavuki.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/rugulatuxabokufired.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mutim.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3969/files/99788349373.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23083433767.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000649c.bin
bc9436f1b53794dc9bbaf2338416bedc7bf8c1a310373a86c486bc72f85d257f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x649C 5780 bytes
font_01_sfnt_off00007833.bin
a9d518aa28549a3ecb46044b72949b7b10be673eb5beee107570affe9093a049		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7833 10128 bytes

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