Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a7e86f0442c325…

MALICIOUS

PDF

47.6 KB Created: 2020-08-28 08:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d7d25888e1d6b1ce6573a30f683b2fa SHA-1: 30a7f2a500426318552ad7b4823aeebb570efd24 SHA-256: 99a7e86f0442c3251b899ee7689688ca63676671d883f5128e308e2147696914
128 Risk Score

Malware Insights

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

The PDF contains a mass of external links, masquerading as a document about 'chemistry final exam answers'. One of these links, https://ttraff.cc/pify?keyword=chemistry+final+exam+answers, points to a known malicious redirector. The presence of a visual download button further supports a social engineering lure. The document body is heavily obfuscated and contains the malicious URL, indicating an attempt to trick the user into navigating to malicious content.

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=chemistry+final+exam+answers
    • http://livezupi.briannadipilato.com/uploads/1/3/0/7/130738970/gamin.pdf
    • http://files.plantandsoiltreatment.com/uploads/1/3/0/8/130813516/6061385.pdf
    • http://files.voyageurmarine.com/uploads/1/3/1/4/131453555/502078.pdf
    • http://files.faithfitnesskzoo.com/uploads/1/3/1/3/131380001/sorovawogapip-negonubux-bifavujokadi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4047/files/angular_form_dirty_check_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/2913/5521/files/17279709575.pdf
    • https://cdn.shopify.com/s/files/1/0434/0357/5454/files/glitz_formal_dress_boutique_houston.pdf
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/63209718270.pdf
    • https://cdn.shopify.com/s/files/1/0432/9478/5704/files/miwalebazed.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4957/files/anti_corruption_commission_zambia.pdf
    • https://cdn.shopify.com/s/files/1/0437/1932/7896/files/towaxavevok.pdf
    • https://cdn.shopify.com/s/files/1/0440/0224/6814/files/pictoword_level_160_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4919/files/63179160193.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2089/files/bootstrap_4_vertical_navbar_template.pdf
    • https://cdn.shopify.com/s/files/1/0436/1817/3086/files/91758787179.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6221/files/45608723711.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_off00006d19.bin
e0dc3e47cfbb0329f7ae696440ec61105db18710c4265d026028257c5402220c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D19 5172 bytes
font_01_sfnt_off00007e97.bin
f5671e5f994a483effa8c0830ea1cde7d9f1921bb817e01ea7f98dffd9b46edb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E97 4920 bytes
font_02_sfnt_off00008c05.bin
820d688038eed439c16cdc99f5682797c3fdbc24ff9da7a614b095aea9e0fbc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C05 11016 bytes