Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8c30a365458864…

MALICIOUS

PDF

38.3 KB Created: 2020-08-28 13:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d9b3b85a9bf7cd1ddcac03a2383e054 SHA-1: fa929a0bde7a8a08376bb0207269dbe014bef527 SHA-256: bb8c30a3654588645d5e64550a45f57b4e8b82fd72ec56cdf2d95f24a08084ee
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/pify?keyword=homophone+worksheets+for+middle+school'. It also contains a PDF link farm heuristic, with many embedded URLs pointing to Shopify and other file hosting services, likely for SEO poisoning or to host further malicious content. The document body, though partially corrupted, contains text related to 'homophone worksheets for middle school', suggesting a lure to disguise the malicious intent. The primary attack pattern involves redirecting the user to a malicious site under the guise of providing educational resources.

Heuristics 3

  • 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.
  • 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.me/pify?keyword=homophone+worksheets+for+middle+school
    • http://files.stefanieedwards24.com/uploads/1/3/1/4/131453332/nibaweba_bozinu.pdf
    • http://kebev.nyyote.com/uploads/1/3/0/7/130739173/40d1bf3565.pdf
    • http://files.maggiemoris.com/uploads/1/3/1/6/131606011/12fdf4d29e9.pdf
    • https://cdn.shopify.com/s/files/1/0450/3732/2390/files/65672142240.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/kidozatal.pdf
    • https://cdn.shopify.com/s/files/1/0439/2937/0779/files/kakomibenoxugiselujanajig.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/sabewage.pdf
    • https://cdn.shopify.com/s/files/1/0433/9639/9269/files/biology_books_for_high_school_students.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8902/files/66703402888.pdf
    • https://cdn.shopify.com/s/files/1/0440/4094/5829/files/furutojewase.pdf
    • https://cdn.shopify.com/s/files/1/0434/8130/1158/files/adobe_photoshop_basketball_jersey_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95936092566.pdf
    • https://cdn.shopify.com/s/files/1/0434/9712/8088/files/facebook_video_firefox_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/9463/8749/files/54030100422.pdf
    • https://cdn.shopify.com/s/files/1/0447/1724/4570/files/bugovevitaval.pdf
    • https://cdn.shopify.com/s/files/1/0431/3628/6877/files/texas_franchise_tax_report.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_off000057e2.bin
32bbd850e3d24f619c0db0c97b3227aadd2354ded5794c9a662e07e18f2bff35
pdf-font-stream PDF embedded font (sfnt) at offset 0x57E2 5300 bytes
font_01_sfnt_off000069d0.bin
8c5696d8fc42d031b96869dc07a3a9e40f6a0c62d4b5d1048e721ab73b829632
pdf-font-stream PDF embedded font (sfnt) at offset 0x69D0 10120 bytes