Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15d8c47176182fa…

MALICIOUS

PDF

41.5 KB Created: 2020-11-03 01:21:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0bc89b546ec73426048b27237fc3979 SHA-1: 750d6f2e0ae761c342cbba921f191f59bb27ec82 SHA-256: b15d8c47176182faa4980ef59054c0c17a8e762bd9d0fb5c91f3515c1cedffe8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier also flagged the document with high confidence. The presence of a link farm suggests an attempt to manipulate search engine results or direct users to potentially malicious content, aligning with a phishing or redirection attack pattern.

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/123?keyword=bulk+oyster+mushroom+grain+spawn
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/db3c4521-08f2-44b0-97d6-66ccafe984c3/wokidizavov.pdf
    • https://s3.amazonaws.com/wuniku/us_navy_style_guide_2018.pdf
    • https://uploads.strikinglycdn.com/files/5d536d53-2a8b-4298-a4a6-e45d84d9c834/bijolubivanuwa.pdf
    • https://uploads.strikinglycdn.com/files/f090d34e-6fc0-4111-95b0-32e26ef53929/58775573036.pdf
    • https://uploads.strikinglycdn.com/files/71914f4a-20c1-4f8d-8a5e-36a77ec694e5/duxuwixepebuki.pdf
    • https://uploads.strikinglycdn.com/files/4ca7b24a-fe92-42b4-8662-3874eecb5dfe/xilofosebemuxufamug.pdf
    • https://s3.amazonaws.com/fifomi/minecraft_survival_test.pdf
    • https://uploads.strikinglycdn.com/files/1839b4d2-ec1d-44c6-aa52-d1985f48cca9/virgin_suicides_jeffrey_eugenides.pdf
    • https://uploads.strikinglycdn.com/files/0dbcad40-ce71-4875-aaa8-79b618f3802b/50838661370.pdf
    • https://uploads.strikinglycdn.com/files/ccaaaf6b-636d-462d-b936-b2e8a37462be/sirotuxonunakanifijewid.pdf
    • https://uploads.strikinglycdn.com/files/1ce188e9-7c6c-4cbc-9179-a73f779f1922/zukafepupotevaxisolej.pdf
    • https://uploads.strikinglycdn.com/files/142573c7-506c-4d47-ba6c-fbe6cc319d86/18696903616.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2040/files/binomial_theorem_mcq.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_off0000637a.bin
e1b7dec301a9b940e8f5b9f4e7097a73cf2e92e4a0468b2747f843c6eefd8ea9
pdf-font-stream PDF embedded font (sfnt) at offset 0x637A 5540 bytes
font_01_sfnt_off00007649.bin
d46052a4220464700d1312573b8ad6b56aa6b4526632989e7f301212e46418d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7649 10344 bytes