Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a8ea01037ae623…

MALICIOUS

PDF

46.0 KB Created: 2020-08-07 07:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad4bbe1da8dbdbffad173c189384b19d SHA-1: 3d9eb03bb5a6752873636aa606537657e1b474c7 SHA-256: 68a8ea01037ae623b3811efa7979242217482b2982772470bbd6a41b54384caa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a mass external PDF link farm, suggesting the primary purpose is to manipulate search engine results or redirect users to potentially malicious content. No scripts were extracted from this sample.

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.com/pify?keyword=bending+emt+conduit+pdf
    • http://files.idlanews.com/uploads/1/3/0/9/130969746/72fd0.pdf
    • http://files.mrshammondhistory.com/uploads/1/3/0/8/130814238/lepadiwegi-bifonej-sixivu-xupuzatafivate.pdf
    • http://files.porthcawlmuseum.com/uploads/1/3/1/0/131070207/1351957.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/how_to_update_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0437/3128/8216/files/29144114672.pdf
    • https://cdn.shopify.com/s/files/1/0428/9930/8711/files/10115893307.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/gejejarukuj.pdf
    • https://cdn.shopify.com/s/files/1/0438/4866/3200/files/43654649673.pdf
    • https://cdn.shopify.com/s/files/1/0435/8488/0798/files/gafesugimaletapofumeveg.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/44121585321.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/26440756727.pdf
    • https://cdn.shopify.com/s/files/1/0432/6886/6212/files/20045988743.pdf
    • https://cdn.shopify.com/s/files/1/0438/9529/2059/files/mass_moment_of_inertia_example_problems_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0439/8209/4494/files/nezato.pdf
    • https://cdn.shopify.com/s/files/1/0431/4018/6268/files/origami_tutorial_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/abraham_maslow_biography.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_off00007771.bin
12d49f6056c6bfc93e5ae549a835d88577ff1da2e067c685026ca02201666108
pdf-font-stream PDF embedded font (sfnt) at offset 0x7771 5008 bytes
font_01_sfnt_off00008879.bin
7f944a5d980d48d18a77fea489a7c7b019012f89be53c06fc12ab5a1d0b1efbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x8879 10260 bytes