Malicious PDF — malware analysis report

Static analysis result for SHA-256 6921adcf7b55480c…

MALICIOUS

PDF

43.5 KB Created: 2020-09-09 16:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2b54512cb46d4b42c125d279f615952 SHA-1: 88e0dfc6a8ea72594ef2e5e16535f8134c8574be SHA-256: 6921adcf7b55480cd768d37f81bbe7150861654c92c96118a548b4767250ae41
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to SEO-optimized PDF files, a common tactic for link farms. One of the primary links directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and embedded links suggest an attempt to drive traffic to malicious infrastructure.

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.me/wix?keyword=khadya+suraksha+yojana+rajasthan+form
    • http://suwomi.greenhectares.org/uploads/1/3/1/4/131410007/bulokivekok.pdf
    • http://denenofiv.johnsguitarrescueandrepair.com/uploads/1/3/2/6/132681351/0f95bfeab957.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0049ca_65abb6c039944e21888356213e233b4c.pdf
    • https://static.usrfiles.com/ugd/b90ba1_17de1f31565e42e496f41c3fb93c2d2b.pdf
    • https://static.usrfiles.com/ugd/ff2e72_ac8e3da1c86a481ebc56f891352c6d3d.pdf
    • https://static.usrfiles.com/ugd/b7082a_48d962382afc418784f15df392cf22d0.pdf
    • https://static.usrfiles.com/ugd/bb05c1_1d04391ae7f8445fae21d800093e72df.pdf
    • https://static.usrfiles.com/ugd/83e584_070d7a2f7d1248b48d5ebd30870f7ea7.pdf
    • https://cdn.shopify.com/s/files/1/0432/2417/0664/files/7810275951.pdf
    • https://cdn.shopify.com/s/files/1/0428/9455/7347/files/sociology_book_for_gnm_1st_year.pdf
    • https://cdn.shopify.com/s/files/1/0432/5431/7214/files/inventory_stock_list_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/41157479092.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_off00005775.bin
e3db842fde9e89e31ffa381ba60124ba6b0227d0c9b9dfc788b8b1be89a1c985
pdf-font-stream PDF embedded font (sfnt) at offset 0x5775 5328 bytes
font_01_sfnt_off00006979.bin
2bd8e24d63d2edfe34b671b2b376cff877031f012fcd44e57ac7f732c2b39213
pdf-font-stream PDF embedded font (sfnt) at offset 0x6979 10012 bytes
font_02_sfnt_off00008c0c.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0C 16164 bytes