Malicious PDF — malware analysis report

Static analysis result for SHA-256 5405d0deb0a08d32…

MALICIOUS

PDF

45.6 KB Created: 2020-08-24 17:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 850040e9c5cb31f6dad1db2e561fd47a SHA-1: 2fff7cf76ac3fddcd3387e16b28e0302e4a6a432 SHA-256: 5405d0deb0a08d32ef1b26bd91c809a911e0b0107deff237a0b07d29ec448f61
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector link farm. The document body, though partially corrupted, contains text suggesting it is an 'answer key' and includes the malicious URL, aiming to deceive the user into clicking it. The presence of a visual download button further supports a social engineering lure.

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.
  • 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
  • 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=cellular+respiration+pdf+answer+key
    • http://wupeda.stevewelchcreative.com/uploads/1/3/0/9/130969060/zorezapanubem-gaxolawedim-wopovedilotiti-zujelume.pdf
    • http://files.qldphilconsulate.com/uploads/1/3/1/4/131483281/vafax-bufezufera-xudilekipepil-rarideras.pdf
    • http://tofimaso.ojrbandmpo.com/uploads/1/3/1/4/131407226/ravunizimibum_rarib_lixolitu_gizat.pdf
    • http://vofev.mhschoirs.org/uploads/1/3/1/4/131407227/bivebigivoluna.pdf
    • http://kevoga.libertoonian.com/uploads/1/3/0/8/130874493/jajifipolo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/57981602640.pdf
    • https://cdn.shopify.com/s/files/1/0430/9522/8565/files/hashar_song_status.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/3071408253.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/zedemuwukudagabivafujat.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8248/files/bokefazolukopobojeludawiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/9043/5495/files/bodmas_questions_for_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0439/1760/7067/files/mutawabalapofoweval.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/lijafazajopinipal.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1866/files/luriri.pdf
    • https://cdn.shopify.com/s/files/1/0434/6540/8662/files/66817475374.pdf
    • https://cdn.shopify.com/s/files/1/0428/4973/0727/files/96063373603.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/51710422432.pdf
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/bozolatonijurobeg.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_off00007300.bin
5543b488a7ba26d384879196342507fab95a68f4e406484e09f3f07c5f615b68
pdf-font-stream PDF embedded font (sfnt) at offset 0x7300 5196 bytes
font_01_sfnt_off000084d5.bin
1422b3a9a629a8d3570963d6d8566dd580d69a993eeefc686a5f8d0ac059e521
pdf-font-stream PDF embedded font (sfnt) at offset 0x84D5 10648 bytes