Malicious PDF — malware analysis report

Static analysis result for SHA-256 815c0854db0892e2…

MALICIOUS

PDF

54.1 KB Created: 2020-08-24 02:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b31c91811867b16fc663a45cd9bde649 SHA-1: 986b5e811c81ab45ac8550d6cacb7a8bc2f3abc4 SHA-256: 815c0854db0892e23441528e6381aeab79051386681d2f8f58346dc7e8d961f7
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text referencing 'Zombie catchers app free' and a URL that appears to be a lure. The presence of a malicious redirector and a link farm suggests an attempt to drive traffic to potentially harmful content, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.cc/pify?keyword=zombie+catchers+app+free
    • http://kenowidu.angelascreativecatering.com/uploads/1/3/2/6/132695540/8d884e.pdf
    • http://serozim.troutvalleycommunity.com/uploads/1/3/1/6/131606349/b42ade5466e65.pdf
    • http://pikilufof.hhsclassof1979.com/uploads/1/3/0/8/130814229/lumemabegu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/86412411031.pdf
    • https://cdn.shopify.com/s/files/1/0439/3772/6622/files/xogivo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9664/5538/files/green_building_design_construction.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2524/files/764341454.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9709/files/vajasekevevosi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6524/3813/files/67969398509.pdf
    • https://cdn.shopify.com/s/files/1/0438/3608/0288/files/gummy_bear_cartoon_video.pdf
    • https://cdn.shopify.com/s/files/1/0434/9788/1766/files/question_answers_of_history_class_9th.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7082322425.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/tilusokiwodokaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/4252/0739/files/sarifod.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071dc.bin
1344c97f35263cc6fdb9c63e9bd85cd4ea645cb0606c9c88ee99908c72e8865f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DC 5320 bytes
font_01_sfnt_off000083c7.bin
eca5340c46f44229035e3031c9e7a69c9dbcf1d973afb8ac0318da0fb79ddce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C7 4856 bytes
font_02_sfnt_off000090f2.bin
7094c0c00f5615e4355027abe7a58da53638b0dce48f2b1bd314d4e8b3f86edd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90F2 10464 bytes
font_03_sfnt_off0000b508.bin
552e926f59ef53231249b6015cc51882b512f7a40c6b17c25f707dc25a221893		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB508 16368 bytes

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