Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f2b4a8ef390bb2…

MALICIOUS

PDF

32.4 KB Created: 2020-08-02 17:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c46732fc9a4d0dd2d50c29eb400de48 SHA-1: aa54b57afcbb8197628f59983a372bddcfd831cd SHA-256: 10f2b4a8ef390bb2474ecd843bb2d01f6543fb26cb79e5da4f94908c1a5a0dee
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to distribute or host malicious content. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs are likely used to lure victims to malicious sites.

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=penn+dot+408
    • http://files.freshanointingiwc.org/uploads/1/3/1/8/131872281/mafokujujux.pdf
    • http://files.skyhighclubcaligroup.com/uploads/1/3/1/4/131409074/derifulupi.pdf
    • http://files.friendsofmillerhouse.org/uploads/1/3/0/8/130874180/rofire.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7029/1096/files/the_guy_from_boston.pdf
    • https://cdn.shopify.com/s/files/1/0435/5706/0769/files/xesororinepizisedegukevow.pdf
    • https://cdn.shopify.com/s/files/1/0430/4004/7253/files/hobbit_name_generator.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42778981568.pdf
    • https://cdn.shopify.com/s/files/1/0433/5524/2647/files/kekesobamaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/7637/8014/files/babubut.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0181/files/83479050393.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/96600052736.pdf
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/vubodis.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/nelewoxokerizoputerufeku.pdf
    • https://cdn.shopify.com/s/files/1/0434/4371/6262/files/42671211477.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_off00004347.bin
bb515f861fde9152e8bd755bbc5f440b24aab3406a837efcbff174dac59cb885
pdf-font-stream PDF embedded font (sfnt) at offset 0x4347 4728 bytes
font_01_sfnt_off00005377.bin
4b712c7a63ceeb4d9f7f3afeb55a4269ecd43a1d0b29f6ea2864d3bb833fb48a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5377 9996 bytes