Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5f97bdd4499a33…

MALICIOUS

PDF

44.7 KB Created: 2020-07-09 18:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 388787db2757bd8dc90dab0c3b6e5ffb SHA-1: cfdb8bf1f19f0c08d82ece959b7528efa9472346 SHA-256: 8a5f97bdd4499a330c9b76fc2a6f0da007d1aaeed3583bb33a113928504bc688
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

This PDF document contains numerous embedded links, including one pointing to a known malicious redirector at 'ttraff.com'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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/wb?keyword=broad%20spectrum%20antibiotics%20pdf
    • http://files.thestayproject.net/uploads/1/3/2/8/132814476/1943586.pdf
    • http://files.kimberlyjherb.com/uploads/1/3/1/4/131407734/6aaa27c09255.pdf
    • http://files.centralvetimaging.com/uploads/1/3/2/7/132712174/samukoxilavu_potunizifategel_japume_gomafo.pdf
    • http://files.riccijustisart.com/uploads/1/3/2/6/132696280/tanepuwimoxe-fofan-nufema-nuxebusazokolez.pdf
    • http://files.clayandgrover.com/uploads/1/3/1/0/131070527/7662012.pdf
    • http://files.texascenterforregionalstudies.net/uploads/1/3/1/8/131856381/29afc.pdf
    • http://files.guillome.nl/uploads/1/3/0/7/130739401/5772c9.pdf
    • http://files.helpabee.org/uploads/1/3/0/7/130738562/derepajoda.pdf
    • https://dowutoweviki.files.wordpress.com/2020/06/4969533341.pdf
    • https://ketowal.files.wordpress.com/2020/06/gezag.pdf
    • https://xuzetepevot.files.wordpress.com/2020/06/kedelekewe.pdf
    • https://gipofonamu.files.wordpress.com/2020/07/37301674391.pdf
    • https://wajowobosub.files.wordpress.com/2020/06/jedikelebeluwiduwaf.pdf
    • https://kosupapa.files.wordpress.com/2020/07/71328755993.pdf
    • https://wugipiba943421545.files.wordpress.com/2020/07/96868753251.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/90442425312.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53978683100.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fovurasavelibegesixaga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gujogu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070e9.bin
a99449e368b40049828ba3790e0b0e3ac033069f6f89e97d908cc7087cc8fe8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E9 5340 bytes
font_01_sfnt_off000082f2.bin
8ed60a87f9b15cc880280bf0d33bfd9ee6521f72be929916e0d12b8670a13edc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F2 10264 bytes

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