Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb1790fc5020c15…

MALICIOUS

PDF

43.6 KB Created: 2020-08-29 04:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38b6842dd00beab52691d00d21ad780b SHA-1: 7faf0be32241c87e99f2ac26f66772e625e705bf SHA-256: 1fb1790fc5020c158dfa24615b0575775433a417299c229395c59cdaaeaf3e2a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure related to Pokemon guides, aiming to trick users into clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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=pok%2525C3%2525A9mon%25253A+let%252527s+go%25252C+pikachu%252521+pok%2525C3%2525A9mon%25253A+let%252527s+go%25252C+eevee%252521+official+trainer%252527s+guide+pok%2525C3%2525A9dex
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_14bc6957236c4121b92d4b9c3224770d.pdf
    • https://static.usrfiles.com/ugd/b8c837_434b0b7edf3a4f50a66ee6efdd1fdb75.pdf
    • https://static.usrfiles.com/ugd/b8c837_34adb5eaa6b245c2b452b7330120860a.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/pikapusefigafum.pdf
    • https://cdn.shopify.com/s/files/1/0430/9050/9973/files/311367107.pdf
    • https://cdn.shopify.com/s/files/1/0438/7821/9944/files/25388917144.pdf
    • https://cdn.shopify.com/s/files/1/0434/1284/8790/files/75328202489.pdf
    • https://cdn.shopify.com/s/files/1/0436/9635/7530/files/calculus_12_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51439980706.pdf
    • https://cdn.shopify.com/s/files/1/0429/0415/8375/files/4854718346.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8388d73db444d69a14b93bc18b36f80.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbbf0d3f14394fbb96d46ad2b79530c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_71579a2e973a4942a47c4e245a47f217.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_off00006649.bin
1d308b82db0c66fc01978e72ce61ede288dea087e6e4edf3f27699d1a2053f0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6649 6092 bytes
font_01_sfnt_off00007ab9.bin
4c8c308c3e606e772cf637554c4e00def60a3ff3961004626e90834871f7255f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB9 10008 bytes