Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8a3f2947819f62…

MALICIOUS

PDF

44.2 KB Created: 2020-08-31 03:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 486b2c2271840b62f08b6e3e70475496 SHA-1: 990e853a1719e2460f34f299189433d916aa4478 SHA-256: 0f8a3f2947819f627541c1f53fb593d6a57f7d9446919942251102e9990c7abf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous other PDFs, with one primary link leading to a known malicious redirector. This suggests the document is designed to funnel users through malicious infrastructure, likely for phishing or malware distribution. No scripts were extracted, and the document body is heavily corrupted, but the presence of the malicious redirector is a strong indicator of malicious intent.

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/wix?keyword=trouver+le+terme+g%25C3%25A9n%25C3%25A9ral+d%2527+une+suite
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0133/1360/files/jonisatewadugibi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/75259073461.pdf
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/chik_chik_let_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8505/files/2567087918.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6326/files/chimie_atomistique_exercices_corrigs.pdf
    • https://static.usrfiles.com/ugd/2f07a1_1151ca9ee3bf4311b98ff3c496f03c1f.pdf
    • https://static.usrfiles.com/ugd/ae059d_2b1a09c1fe6d4502acb469c6bae57000.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a552d5df2ab48a4a75e0b855a9c23be.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9563/files/basenopuxefanedi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7960/5147/files/calculus_early_transcendentals_rogawski.pdf
    • https://cdn.shopify.com/s/files/1/0438/6829/1232/files/90785083866.pdf
    • https://static.usrfiles.com/ugd/850f07_61d5968ca6504d89a5cf1b15d82f268a.pdf
    • https://static.usrfiles.com/ugd/49be48_9c4044afbf784e8a9477ca050c9e53f9.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_off0000679a.bin
877e420e3a7b776c7cc9722ca4b3b2b2060db9cae2a65a574bb2648466872a1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x679A 5332 bytes
font_01_sfnt_off0000796f.bin
ab5c9420cf4013580b0dc0d274464f1fe15ec66c8ea5798fa8667198d57edafc
pdf-font-stream PDF embedded font (sfnt) at offset 0x796F 12800 bytes