Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8c5f4b9ae4f3b0…

MALICIOUS

PDF

47.7 KB Created: 2020-09-12 03:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5823d859b9f6b9578cfb4645207bb836 SHA-1: 773a40632714a014d439a177d28d060761f5c932 SHA-256: 6f8c5f4b9ae4f3b015794bf35f4fc90ab9c11b94d9a2cc42a7f920070e32a44c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to suspicious domains and are flagged as malicious redirectors. The document body, though heavily obfuscated, contains text related to 'research article example pdf' and includes the primary malicious URL, suggesting a lure to a link farm designed to redirect users to potentially harmful content. 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.me/wix?keyword=research+article+example+pdf
    • http://files.sbrathcormac.ie/uploads/1/3/2/8/132815050/wowadatijagoro_goforizedoz.pdf
    • http://divinefe.earningadmission.com/uploads/1/3/1/3/131378970/7985851.pdf
    • http://files.mprints.shop/uploads/1/3/1/4/131453018/3ce914215c3e.pdf
    • http://files.pixiecovers.com/uploads/1/3/0/9/130969327/gulelifukov.pdf
    • http://figenipe.ddjohnsonassociatesllc.com/uploads/1/3/0/8/130814579/1931964.pdf
    • http://xepan.dalymanningopticians.com/uploads/1/3/0/8/130874198/405ccd.pdf
    • http://jutemo.vhcministry.org/uploads/1/3/1/8/131856695/beriruju_zisukuluso_tepakevagitud_jirisi.pdf
    • http://rufepovaf.flexosc.com/uploads/1/3/1/6/131606490/molit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/02beb7_a7909b5ef58c4e04a88bedd4acb3d127.pdf
    • https://static.usrfiles.com/ugd/5360f8_69e28ac1fe22432e98c2b802cf850d51.pdf
    • https://static.usrfiles.com/ugd/b73feb_465896b97e34431c9f7aa1ff7460956c.pdf
    • https://static.usrfiles.com/ugd/8e7730_3ae160dc03d1432f893d3811ff0d8c00.pdf
    • https://static.usrfiles.com/ugd/921909_c7d634288f124f6983705fa5a38ab8c0.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_0de5b86e2c534906b3bfc46118efcbe7.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c8bc529c4e34f1496d0b4591b5addac.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dd4.bin
b83a48b0f830413e6188d35099d9377d07611cc9c55f770518a6fd4079a29139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD4 5040 bytes
font_01_sfnt_off00007efc.bin
2f6c17ba1239d7bc0f0e2cef5217b375fb8441a097739fe054dc726e886e6959		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFC 10792 bytes
font_02_sfnt_off0000a399.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA399 4324 bytes

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