Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8794802c267973…

MALICIOUS

PDF

34.7 KB Created: 2020-08-22 17:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 645270ddf69b5aefc3b83531b30cb8fc SHA-1: 2e6432113456b23b5c2c986408167e28c606d8bb SHA-256: 0c8794802c267973876efe66c1dcd776e325f56eb43cfb846c0d443b8ec05c82
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm. One of these links, https://ttraff.com/pify?keyword=countdown+conundrums+with+answers, is identified as a malicious redirector. This suggests the document's primary purpose is to redirect users 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.com/pify?keyword=countdown+conundrums+with+answers
    • http://files.profedenham.com/uploads/1/3/1/3/131384771/vaxobadafiwodo.pdf
    • http://jozupam.crrcinc.org/uploads/1/3/1/4/131454215/tuzem-vaseviv-zawezok-bokikugetoz.pdf
    • http://files.janbenhamcosmetics.com/uploads/1/3/2/8/132815359/dusabixeguselej-wilojazogu-tiguwojariju.pdf
    • http://files.willycosmosguidetohotsprings.com/uploads/1/3/2/6/132682723/9d2a0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1230/9671/files/jogok.pdf
    • https://cdn.shopify.com/s/files/1/0439/7744/1438/files/zofulukudekibixu.pdf
    • https://cdn.shopify.com/s/files/1/0438/8333/1752/files/businessman_movie_telugu_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/4729/6922/files/beverley_craven_promise_me.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/ladorusufe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6719/5040/files/11180758505.pdf
    • https://cdn.shopify.com/s/files/1/0437/6644/8279/files/gisufer.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/21153690671.pdf
    • https://cdn.shopify.com/s/files/1/0436/4340/4441/files/12280948962.pdf
    • https://cdn.shopify.com/s/files/1/0437/3073/1173/files/photosynthesis_lab_gizmo_answer_key_page_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/3908/8022/files/mcgraw_hill_anatomy_and_physiology.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_off000049c8.bin
f2c42bf3d7fede710ed05c054eb6ce695ccb5699e94bed6d6d0a17e7da95ca7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x49C8 5144 bytes
font_01_sfnt_off00005b25.bin
fd18bafde345b202749095a47349a5b0fe7066348c74c7ad9cf40e6d12aa2076
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B25 10244 bytes