Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f39f3acab2a5d02…

MALICIOUS

PDF

41.7 KB Created: 2020-08-18 13:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 887d9487ec4cd884ad35ae4ba31aeb4e SHA-1: 6cfc51f9e107d5d9348860e6d2ea2d3ab04d3d58 SHA-256: 9f39f3acab2a5d021d3a6401afe979c536f94bb42022949ca2d799b5701b228e
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which is also present in the document body. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. The primary malicious URL is `https://ttraff.cc/pify?keyword=equivalent+fractions+and+decimals+worksheets+4th+grade`, which is likely used to redirect the user to a malicious site. The document body text, while appearing to be educational material, is likely a lure to encourage clicks on the malicious link.

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.cc/pify?keyword=equivalent+fractions+and+decimals+worksheets+4th+grade
    • http://files.mysticfighters.com/uploads/1/3/2/6/132680926/baxalumijomagopa.pdf
    • http://files.electrikhana.org/uploads/1/3/0/8/130873922/2ab63c49d07ff6.pdf
    • http://belosapo.kitsbbqexpertsonline.com/uploads/1/3/1/4/131407815/1049197.pdf
    • http://wexasumo.redwordediting.com/uploads/1/3/0/8/130814328/c70ada79a6.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/55469614473.pdf
    • https://cdn.shopify.com/s/files/1/0454/8689/9350/files/the_beatles_something_chords.pdf
    • https://cdn.shopify.com/s/files/1/0433/4629/6982/files/18799477750.pdf
    • https://cdn.shopify.com/s/files/1/0437/0900/5978/files/nuzebiwomisip.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/suxejedubokezikuser.pdf
    • https://cdn.shopify.com/s/files/1/0432/2924/9694/files/teori_indeks_pembangunan_manusia.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/pdf_file_to_word_converter_software.pdf
    • https://cdn.shopify.com/s/files/1/0439/5322/5883/files/effective_communication_skills_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/4213/6476/files/zilubup.pdf
    • https://cdn.shopify.com/s/files/1/0431/4487/2085/files/angular_datepicker_directive.pdf
    • https://cdn.shopify.com/s/files/1/0437/0599/1321/files/62578084279.pdf
    • https://cdn.shopify.com/s/files/1/0428/8577/5519/files/gegad.pdf
    • https://cdn.shopify.com/s/files/1/0428/6427/9718/files/60840938662.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_off000063ab.bin
8670e2dd0c9e0707575ece1e5c859b82a32c435eea9985a8182ad0590dae66c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x63AB 5820 bytes
font_01_sfnt_off0000776e.bin
4207120c6219b852f1bd22cbfdb4109d22226aa40091c28f12780cfe751f53d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x776E 9972 bytes