Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba1f5ac9b2d41be…

MALICIOUS

PDF

40.4 KB Created: 2020-08-30 11:39:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5b1e7e9368d0d5cc84eebbfe82ffd51 SHA-1: 065b9d1d2578bc1ecd67affb5004180d87afc2ff SHA-256: 8ba1f5ac9b2d41be21e771d7ffd50932427bc999377110537091b6a112b45598
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a critical heuristic due to the presence of a redirector link to a known malicious infrastructure. Additionally, it contains a large number of external links, many pointing to shopify.com, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL.

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=la+voici+la+nuit+de+dieu+partition
    • https://cdn.shopify.com/s/files/1/0429/4138/2812/files/66225469474.pdf
    • https://cdn.shopify.com/s/files/1/0445/8138/8452/files/ncert_maths_book_download_for_class_8.pdf
    • https://cdn.shopify.com/s/files/1/0430/7592/8215/files/simijovosezunan.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/drdo_ceptam_9_edit_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/1891/9837/files/chromedriver_2._38_for_mac.pdf
    • https://static.usrfiles.com/ugd/b8c837_a275e4d28f764478b9dd137a609f409c.pdf
    • https://static.usrfiles.com/ugd/857e61_d0e99d9c7242434ab7c71468fa496119.pdf
    • https://static.usrfiles.com/ugd/b8c837_6065188ab8e34fb9ba84f9bcf177a299.pdf
    • https://static.usrfiles.com/ugd/b8c837_58411345d1bd491490161519b197cc46.pdf
    • https://static.usrfiles.com/ugd/b8c837_2de0a9dc2c264526926d7851542ac9a4.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3128/files/63692815127.pdf
    • https://cdn.shopify.com/s/files/1/0435/2281/8200/files/descargar_assassins_creed_identity_uptodown_para_android.pdf
    • https://cdn.shopify.com/s/files/1/0438/6612/8549/files/38899107695.pdf
    • https://cdn.shopify.com/s/files/1/0431/5096/6950/files/fivilikakixuwozinofenike.pdf
    • https://static.usrfiles.com/ugd/b9801a_1828fbe94d914a9aa8b0ab2b0624b524.pdf
    • https://static.usrfiles.com/ugd/b8c837_39d35689cf7343b5be459bd2bf20f237.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_off00005fe2.bin
8c7d4b831032640dc5b6e26c59e7c8adaa04f2489c0987a1308404eee3ca11da
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE2 4888 bytes
font_01_sfnt_off00007094.bin
82009f9af53faf3d1813204088a2c3e60f146083e3851946b649f2c2076ccfa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7094 10488 bytes