Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d458d731b037ce9…

MALICIOUS

PDF

53.3 KB Created: 2020-08-08 22:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef396b2b1751b0963769702aea7f864d SHA-1: a2437d1d6cad3fc1776277cd7731e52b2b4f315d SHA-256: 3d458d731b037ce93b8621de502d643d2aab915f40f31b59da9e3e23c9da40ea
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a link farm with numerous external PDF links, many hosted on cdn.shopify.com. The primary malicious URL identified is https://ttraff.cc/pify?keyword=coordinate+geometry+gre+pdf, which is likely used to obscure the final destination or for tracking. The ML classifier also strongly indicated maliciousness.

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=coordinate+geometry+gre+pdf
    • http://files.mollywhitman.com/uploads/1/3/1/4/131437983/wogibup-dudajoweja.pdf
    • http://sexinusa.taunsighald.dk/uploads/1/3/1/3/131379012/pisel_xedopuvujuxin_ragiw.pdf
    • http://files.morinmath.com/uploads/1/3/1/3/131379699/jibuvosuvetu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/60175887640.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/set_precision_c.pdf
    • https://cdn.shopify.com/s/files/1/0437/8427/4081/files/wubebewidimoravafukunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8672/files/85941139074.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6335/files/dojem.pdf
    • https://cdn.shopify.com/s/files/1/0432/0857/3091/files/nyc_sightseeing_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/9578/5629/files/namupemavolopaje.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/zulukizibetawifurokoto.pdf
    • https://cdn.shopify.com/s/files/1/0433/6268/0984/files/lodash_remove_duplicates.pdf
    • https://cdn.shopify.com/s/files/1/0432/1089/9624/files/a_star_is_born_soundtrack_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0432/5467/7662/files/68632880345.pdf
    • https://cdn.shopify.com/s/files/1/0440/9622/5432/files/stihl_fs55r_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008738.bin
2de54e207322d8198559f0996f7b1e3270b551a4c4ec63bcf6ba6a5f03a00ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8738 5064 bytes
font_01_sfnt_off00009869.bin
d4cd34e6ad77d6eaf6fe5d59d27880b47ee09b5a92827de903b51ca868aa7a9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9869 9868 bytes
font_02_sfnt_off0000ba25.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA25 4324 bytes

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