Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ef3ab3a3a5f9ff…

MALICIOUS

PDF

56.7 KB Created: 2020-09-14 00:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1236c177800c4f216c915fba837e2756 SHA-1: eaf2de2540758118134aac06c97fb9f8fa4dc6e0 SHA-256: e9ef3ab3a3a5f9ffde3c896f829d282380530125f878e572d230afd717e4abed
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, with several pointing to known malicious redirectors and link farms. The ML classifier also strongly indicated maliciousness. The document body text, though heavily obfuscated, contains URLs that are likely part of a redirection chain designed to lead the user to malicious content or phishing pages.

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.club/pify?keyword=taylor+series+calculator+symbolab
    • http://files.windhoverceremonies.com/uploads/1/3/1/0/131070030/kijiwov.pdf
    • http://nonavelan.trausti.org/uploads/1/3/1/1/131164173/vibutafonikezab_tukavuvulejex_kozuzesaxexir_kixevofo.pdf
    • http://kisaguxu.andrewcarlosarchitect.com/uploads/1/3/0/7/130775958/sirogara.pdf
    • http://vorefiz.highaspirationsapparel.com/uploads/1/3/0/8/130814124/gikox.pdf
    • http://files.kihananursery.com/uploads/1/3/0/7/130776215/bdc09d7a.pdf
    • http://files.danielpachecophotography.com/uploads/1/3/1/4/131437563/795904.pdf
    • http://dadasezim.nowwwriters.ca/uploads/1/3/1/1/131164278/8531942.pdf
    • https://cdn.shopify.com/s/files/1/0434/6114/8837/files/91653920243.pdf
    • https://cdn.shopify.com/s/files/1/0436/0932/5730/files/faduxidojatapuxelimaxek.pdf
    • https://cdn.shopify.com/s/files/1/0440/7951/3752/files/rusipadiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3031/files/aerosmith_dream_on_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/3327/1191/files/4313030561.pdf
    • https://cdn.shopify.com/s/files/1/0432/0506/6907/files/50536707265.pdf
    • https://cdn.shopify.com/s/files/1/0433/7234/7550/files/30081139297.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/aranmula_vanchipattu_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/2903/6199/files/62088419523.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f94.bin
53a36827d82880ae6bba31e60b22944b12aab6d66ee8712700e97e88ad41b9a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F94 4912 bytes
font_01_sfnt_off00008056.bin
5b100804b49e1dbd921d7e4c3ec7983cb127eb1d31a540aca4e6b4b08debe54c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8056 15448 bytes
font_02_sfnt_off0000b077.bin
e3d583ca8131484f6b7e9991674a220a85ec8466745261d702706f92b0246cac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB077 16080 bytes
font_03_sfnt_off0000c51f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC51F 4324 bytes

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