Malicious PDF — malware analysis report

Static analysis result for SHA-256 efecb1bdd522eeec…

MALICIOUS

PDF

45.3 KB Created: 2020-08-07 09:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 998f9071d741b5992d9a953d4bc4f16c SHA-1: 4dc45450ec1e7fd343b96eb9fd0493011c8a30aa SHA-256: efecb1bdd522eeecf89494fd3fa60eabe02744af714ab551bae8f3b1375b5542
128 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains text related to a syllabus and the malicious URL. The presence of a call-to-action button lure further supports a phishing or redirection attempt. The primary malicious IOC is the redirector URL.

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.com/pify?keyword=rbse+12th+biology+syllabus+2020+pdf
    • http://files.distinctiveautomotivesales.com/uploads/1/3/1/3/131382470/rizag.pdf
    • http://files.ketchikanwhales.com/uploads/1/3/1/1/131164250/551949.pdf
    • http://wijasoled.roadslaves.com/uploads/1/3/0/8/130874064/6636522.pdf
    • http://files.ellesartandjewels.ca/uploads/1/3/1/4/131455158/03aeed4d.pdf
    • https://cdn.shopify.com/s/files/1/0437/9957/6733/files/3042621242.pdf
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/karemuzapuxavoger.pdf
    • https://cdn.shopify.com/s/files/1/0433/5904/3749/files/fobukumoke.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6326/files/adjective_and_adverbs_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/nepitezodefikasakorutit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35535883354.pdf
    • https://cdn.shopify.com/s/files/1/0432/4537/1549/files/wexug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41448402009.pdf
    • https://cdn.shopify.com/s/files/1/0439/7367/3118/files/81331614809.pdf
    • https://cdn.shopify.com/s/files/1/0439/1321/6168/files/82059335249.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/21844875502.pdf
    • https://cdn.shopify.com/s/files/1/0435/1423/3000/files/59788795013.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90262961418.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_off0000660a.bin
9aa4c4086cb0a6c0e56607345a8fb634fbf4ad7e392aab2eebf1aa4d85fb3336
pdf-font-stream PDF embedded font (sfnt) at offset 0x660A 5780 bytes
font_01_sfnt_off000079c8.bin
eb02197903f222b7a1124e2fb72c42989e9da4c06b5a1e15c9071bc742145fe1
pdf-font-stream PDF embedded font (sfnt) at offset 0x79C8 9920 bytes
font_02_sfnt_off00009bfa.bin
0a19bde7dd71b42ad502443bbbe113791974edb2bf4100f03a99e8558393ac86
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFA 2924 bytes