Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4212eaffb8da9b…

MALICIOUS

PDF

52.3 KB Created: 2020-08-30 10:39:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a55b2baf9bf39b3d2f748667ffc52317 SHA-1: 9bff7d9fbe93761f5430d91395cd26be15687577 SHA-256: 0f4212eaffb8da9bff4f318e6f70d2bc101b12c2e46f0b48c242853c8cd2567e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs that redirect to a link farm, with one prominent URL pointing to a redirector. The document body, though partially obfuscated, includes keywords related to free PDF downloads, suggesting a lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious or SEO-farmed content, likely as part of a phishing or malware distribution scheme.

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/wix?keyword=j2ee+complete+reference+7th+edition+pdf+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0462/6232/1301/files/fusionner_fichier_acrobat_reader.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/dudajowiwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/canadian_visa_application_form_cic.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/soxelowisiwir.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9319/files/doluvugotupozu.pdf
    • https://static.usrfiles.com/ugd/2813e2_eaf6e8bd24e84b7ea66e3ddaea308443.pdf
    • https://static.usrfiles.com/ugd/b8c837_8df28bd05ccb41a399151a157c93f8d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2e163d0ad8f4ade89c02e5fa1497de2.pdf
    • https://static.usrfiles.com/ugd/0c4177_ecee3f9ee7b64f269002ff1e23f98acf.pdf
    • https://static.usrfiles.com/ugd/b8c837_ada2f0721fb04a95b53db7b484ab5e3f.pdf
    • https://static.usrfiles.com/ugd/ce5d00_c80c269dc4bd4cb09bf4931c131f6b28.pdf
    • https://static.usrfiles.com/ugd/9e41f0_209b84411e1948dab36215a5c7a318c4.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_2cc3635b0bad4ddaba177f7593500477.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfc587d6c35a4f17877ed0369fc95c21.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_off00008d24.bin
5b555d8d452a7e97cfe2965f9bd2d82c981f2cac61b5c9ffc3bd87b6c0cbb89e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D24 5512 bytes
font_01_sfnt_off00009fcb.bin
7e2918fc0b1396a8288f2586597023ca2285a8ff09b56a71dfe179a04b60a37d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FCB 10468 bytes