Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac1fb6a20c86c22…

MALICIOUS

PDF

42.1 KB Created: 2020-08-21 02:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db09cfbbf54a9cb147f0d6ba43d1b3ac SHA-1: f1dbd05d7507c30524062072c8889c9a872af56b SHA-256: 3ac1fb6a20c86c22e9ba3d24309e734d391f91e9af8a44f4fe29c7bc9286b352
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the string 'number theory example sheet' and the malicious URL, suggesting a lure to a malicious site. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=number+theory+example+sheet
    • http://files.kaprentals.com/uploads/1/3/1/4/131409309/jafosof_vefugosubati.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7020/files/grooveshark_playlist_recovery.pdf
    • https://cdn.shopify.com/s/files/1/0440/3603/0614/files/41336182476.pdf
    • https://cdn.shopify.com/s/files/1/0437/9531/6896/files/92913568569.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/98601878361.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/53351742948.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/epidemiologia_nutricional_gilberto_kac.pdf
    • https://cdn.shopify.com/s/files/1/0428/8898/6783/files/30316480542.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3568/files/reputational_risk_management_in_banks.pdf
    • https://cdn.shopify.com/s/files/1/0435/5126/0823/files/72470049178.pdf
    • https://cdn.shopify.com/s/files/1/0447/8612/2901/files/vehicle_dynamics_and_control_rajamani.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_off00006517.bin
f17b1240fa49f66b9e5b1d6e36a772b3a1201c7f369e6eeeca5616c16ab18eba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6517 5340 bytes
font_01_sfnt_off00007722.bin
6b1967f94e069c51f868c92163e501779bc825c64a573ca2924498054b96e54c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7722 10896 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.