Malicious PDF — malware analysis report

Static analysis result for SHA-256 043898b1a7683806…

MALICIOUS

PDF

35.6 KB Created: 2020-08-30 16:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 040ba9d089c15b90938b4a6e03e3c504 SHA-1: 65e47a81f17f513256d7dbfd641045311462fdff SHA-256: 043898b1a76838066a6b20c685e2dffabffa7dc6bcc2687290b96ea6997d3ff5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to an 'Istanbul metro map app'. The presence of numerous external PDF links, many pointing to benign content, suggests a link farm or SEO poisoning tactic to obscure the malicious redirector. 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.com/wix?keyword=istanbul+metro+map+app
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_16ebe99b704746ec9d98455de98a22e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1883669ff4c45148f125acd4cf4194b.pdf
    • https://static.usrfiles.com/ugd/04e6f9_e0366d5faad740c8bb045e3f8f919702.pdf
    • https://static.usrfiles.com/ugd/b8c837_779a8f071e7742d2b48e30c0235c4d51.pdf
    • https://static.usrfiles.com/ugd/b8c837_356dc075a8df438885c06052ce8c0c88.pdf
    • https://cdn.shopify.com/s/files/1/0431/4012/0733/files/jekafuv.pdf
    • https://cdn.shopify.com/s/files/1/0462/6140/3802/files/somizopek.pdf
    • https://cdn.shopify.com/s/files/1/0436/6116/4697/files/2018_aha_cholesterol_guidelines_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0429/4092/4063/files/autocad_2015_2d_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0463/8353/0139/files/swot_analysis_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/7125/8278/files/33930258400.pdf
    • https://cdn.shopify.com/s/files/1/0434/4892/6364/files/x3daudio1_7_dll_is_missing_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/chrome_browser_old_version.pdf
    • https://cdn.shopify.com/s/files/1/0428/3881/8982/files/nuzudiratefewokowu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5836/2518/files/vekel.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7178/files/26442211285.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/rofusagajamamawadow.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_off00004ea2.bin
7e428752b6c4f49ceae6fa9c8020d36f706633ba10b90168092f781db730f492		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA2 5040 bytes
font_01_sfnt_off00005f98.bin
9cda785f8b5e5e97a87ec556ce6c9bf4a6fea0a9f537af26b79736331d72bc28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F98 9996 bytes

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