Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b7dd32aa6129dc…

MALICIOUS

PDF

40.0 KB Created: 2020-07-11 23:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d62425141fbe7edcfd0bae965b2247ae SHA-1: d0fe3a6bc5eb380d9ec0bfa8aa7a62c2a6185b63 SHA-256: 51b7dd32aa6129dc129197c4b49a3306f1df66a0e83af0684540b584e166534e
128 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains that appear to be part of a link farm designed to host malicious content. One critical heuristic firing indicates a direct link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'SSC stenographer previous year paper 2018 pdf' and includes the malicious URLs, suggesting a lure to download potentially harmful 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/wb?keyword=ssc%20stenographer%20previous%20year%20paper%202018%20pdf
    • http://files.meghanfoleyyoga.com/uploads/1/3/0/9/130969591/5feaec9c3be6188.pdf
    • http://files.statebirdtogo.com/uploads/1/3/2/7/132710687/a1b067.pdf
    • http://files.freeshawnali.com/uploads/1/3/1/3/131379951/pepesebosewep-gilotos-xovavo-ruvanidetu.pdf
    • http://files.hypnosisworkz-sp.com/uploads/1/3/2/6/132695352/6278970.pdf
    • http://files.stampmyfeet.com/uploads/1/3/0/8/130814605/kasazejarajok_faxinare_biwuruduxeg_sotifikoxisu.pdf
    • http://files.kruetz.com/uploads/1/3/0/8/130874299/5497497.pdf
    • http://files.brookeannibale.com/uploads/1/3/0/8/130813516/mugaja.pdf
    • http://files.northernmichigangallery.com/uploads/1/3/1/3/131380666/972805.pdf
    • https://ruvuwixolax.files.wordpress.com/2020/06/jegebugadi.pdf
    • https://bokevupe.files.wordpress.com/2020/07/64336086531.pdf
    • https://vojunedipobe.files.wordpress.com/2020/06/73325522377.pdf
    • https://titoxed.files.wordpress.com/2020/07/17277325337.pdf
    • https://nulonexix.files.wordpress.com/2020/06/wadeduwudilipa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasidobedibugamis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58085676994.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2072/files/judajesuvemasupekodonep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/malerofefamizekigo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/85433220273.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mobisibat.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_off00005b2d.bin
8da6a4713e7503948c038695565d3868b3591488a09fe2e6dc38a28c80e2834d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B2D 6052 bytes
font_01_sfnt_off00006fba.bin
67f78ea7b3aa4401529eb38b0a894d5684d0905c5eea3edfef28a8d6e31c7d5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBA 10316 bytes