Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a56fd46c6e4c4de…

MALICIOUS

PDF

45.3 KB Created: 2020-09-11 11:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d282772c59bff16342efb2f15c70aaa9 SHA-1: 98e021fce3837f9ea85c52b59f6100df9f208ce8 SHA-256: 5a56fd46c6e4c4de4fd2aa10db7c1f77f3b5eff6f749ebe87142f6e925695813
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains heuristics indicating it is a malicious redirector and part of a link farm, with a high ML classifier score. The document body, though partially garbled, contains text related to forms and percentages, aligning with the 'invoice lure' heuristic. The primary malicious IOC is a redirector URL that is likely used to funnel victims to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.link/wix?keyword=b+ed+form+apply+percentage+2018+rajasthan
    • http://files.infinitemansummit.com/uploads/1/3/0/9/130969768/8917ca2cb368abf.pdf
    • http://xipadomeb.orthoappmobile.com/uploads/1/3/2/8/132816165/0be1aaf0da8.pdf
    • http://files.swiperpm.com/uploads/1/3/1/3/131383621/5d35884.pdf
    • http://files.nicknewmont.com/uploads/1/3/1/1/131163986/1cfb4513073.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/590778_5b4b6ee3b64445e3999b3c6933325c25.pdf
    • https://static.usrfiles.com/ugd/fedf23_eb349676b9914d70b38f257c4e54dae1.pdf
    • https://static.usrfiles.com/ugd/4c1554_ae73c6ae7dd34ed3a4032820b99e78d4.pdf
    • https://static.usrfiles.com/ugd/bd1c09_e74db2ae4f5449c98e2a3aabac0beee3.pdf
    • https://static.usrfiles.com/ugd/cac9e4_1d2defbead504ffaac911e9309b58eb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_82bde895ce6f40999d80045b31ea7c76.pdf
    • https://static.usrfiles.com/ugd/9e14ca_09ca1685d1d64e7280b0bc9829ece202.pdf
    • https://static.usrfiles.com/ugd/61f964_2ddb186845dd4100b78c220293e016eb.pdf
    • https://static.usrfiles.com/ugd/754d94_9c3bb07a57b148f5a7995c279283484f.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/semaferukapudodatonevez.pdf
    • https://cdn.shopify.com/s/files/1/0431/6243/5745/files/agar._io_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/lcm_of_8_and_3.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_off0000688e.bin
b33752dbf7c21648162cebc8f3eda3dc7abf6d44da83e50dba2b3780d666f92e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x688E 6316 bytes
font_01_sfnt_off00007df4.bin
15f4587f230bfbab6515f50bd8a26e61b475f12db689d4b0587724057dec2eb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF4 13244 bytes

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