Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec3c626269dd940…

MALICIOUS

PDF

41.8 KB Created: 2020-08-29 18:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e84a7f5a5c6c76a33cf2094a0a656b6 SHA-1: 7e9f146d1e2d8f6f5466ccf82bfa0720f259655b SHA-256: 3ec3c626269dd94018ca394e353a6e5717a18af58313c79e864a8a899124c306
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, suggesting an attempt to lure users to malicious infrastructure. The presence of a link farm and a critical heuristic firing for a malicious redirector strongly indicate this is a phishing or redirection attempt.

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/wix?keyword=tru+time+talking+atomic+watch+instru
    • https://cdn.shopify.com/s/files/1/0441/4016/7320/files/case_files_pediatrics_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/99503064371.pdf
    • https://cdn.shopify.com/s/files/1/0430/3264/1689/files/properties_of_bessel_function.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3866/files/aprender_italiano_desde_cero.pdf
    • https://static.usrfiles.com/ugd/4d6844_cbc088ac1f5c424bb8dcbcecc103a59f.pdf
    • https://static.usrfiles.com/ugd/b8c837_75c628a5be214b1691c4ee4cf0d159f7.pdf
    • https://static.usrfiles.com/ugd/b65acf_71ab84cce08b464390fe13df3a95d9dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_a32a52964d8f440ab9dfd5f79824a3d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_89ba8acef18a416eab540a220f16fe61.pdf
    • https://cdn.shopify.com/s/files/1/0434/8831/3510/files/10360083775.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/85813394186.pdf
    • https://cdn.shopify.com/s/files/1/0463/2471/1586/files/it_project_manager_resume_template_w.pdf
    • https://cdn.shopify.com/s/files/1/0432/3937/5012/files/give_me_an_address.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/53755362253.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5885/files/4_44_torrent_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2101/files/best_android_phone_review_2019.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006273.bin
c381fe37ac48708fed14fb89c2c2b0effcbdbebbee163775b540a54cde210db0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6273 5320 bytes
font_01_sfnt_off00007464.bin
4332ed07791a7fcf6d976e6148e1924774a6a15e0cbac9cac8beccdb589aa6e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7464 10580 bytes