Malicious PDF — malware analysis report

Static analysis result for SHA-256 26dd1f0017a48dfc…

MALICIOUS

PDF

54.5 KB Created: 2020-08-04 13:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd662e02c245ce045be9a8d43c3c17ec SHA-1: 705d6ca3ab81309a1d2b6d609ac2565c19aacef0 SHA-256: 26dd1f0017a48dfcb18d7a2b0c8db51c99eed1cb04c19d98ed0bfc5d93a3ef77
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=windows+alt+codes+pdf', suggesting a lure to disguise malicious activity. The presence of a link farm and the ML classifier's high confidence score further support malicious intent. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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/pify?keyword=windows+alt+codes+pdf
    • http://files.outbuildingsok.com/uploads/1/3/1/3/131384301/xonutu.pdf
    • http://files.evilsizor.co/uploads/1/3/0/7/130775701/713262.pdf
    • http://files.orlandidancecenter.com/uploads/1/3/2/8/132815388/2a317.pdf
    • http://files.westgarthpharmacy.com.au/uploads/1/3/0/7/130739174/fufajolegukago-safukoxave.pdf
    • http://files.guidedlondontours.com/uploads/1/3/0/8/130874154/1494532.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/game_theory_101.pdf
    • https://cdn.shopify.com/s/files/1/0428/5235/2159/files/93922840190.pdf
    • https://cdn.shopify.com/s/files/1/0433/4275/8053/files/rilowuvupukobobuxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/43244344810.pdf
    • https://cdn.shopify.com/s/files/1/0437/4953/9989/files/ohio_sample_ballot_2016.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/xepivow.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/11299603583.pdf
    • https://cdn.shopify.com/s/files/1/0433/2548/9305/files/jspdf_autotable_footer.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/wotidufaxatutukav.pdf
    • https://cdn.shopify.com/s/files/1/0440/2737/9877/files/pajotipidavaxevi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/64474258062.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_off000065eb.bin
26b21d72e333f62300dbf75cc76c692fa16f3b7d89eeaeeb54343f30c2485f81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65EB 5160 bytes
font_01_sfnt_off000077aa.bin
b0ff8610b60dbd22f49385733188e3b0d9e4abf39dc8893c05fd8a8f72ce2b07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77AA 22332 bytes
font_02_sfnt_off0000b7d1.bin
87a199faeecd26aad7498515852057626d94c795e183073de7856e10e0461db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D1 16160 bytes

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