Malicious PDF — malware analysis report

Static analysis result for SHA-256 9244f6f145a10f75…

MALICIOUS

PDF

44.8 KB Created: 2020-08-16 21:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 935bf12917a97c288dce331a7d5d4500 SHA-1: c547210cbdac1893acc3e8e4f3bfe5e7134a6412 SHA-256: 9244f6f145a10f7512d21228f5f366e40b9b2ff26df873df375b19782191c51d
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is an answer key, likely a lure. The primary malicious URL, 'https://ttraff.ru/pify?keyword=interactive+reader+physical+science+answer+key', is the most critical IOC, as it likely leads to further malicious content. The file also exhibits characteristics of a link farm, with many external PDF links.

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.ru/pify?keyword=interactive+reader+physical+science+answer+key
    • http://files.spectorlondon.com/uploads/1/3/1/4/131438538/vadiwatalixej.pdf
    • http://files.swaptimeusa.com/uploads/1/3/2/7/132741429/dedokopobatokoz_setudiwapate_supedopuwamedip_wuleno.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/75097284576.pdf
    • https://cdn.shopify.com/s/files/1/0435/7927/7467/files/13810405020.pdf
    • https://cdn.shopify.com/s/files/1/0437/4131/5223/files/93088482264.pdf
    • https://cdn.shopify.com/s/files/1/0432/2246/6727/files/data_scientist_skills.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/lojipomujitawozobeguk.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/aiou_ba_admission_challan_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/0681/1560/files/belolosefuti.pdf
    • https://cdn.shopify.com/s/files/1/0435/8320/9633/files/peberosuzuzeguwesutajopu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2869/2643/files/36643877262.pdf
    • https://cdn.shopify.com/s/files/1/0439/2442/2811/files/troy_bilt_2700_psi_pressure_washer.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_off000060b6.bin
91536650208fe3af7df85ecc1f9b6c7ea8b11f6f7e3fc076d041a9d08e3189a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B6 5092 bytes
font_01_sfnt_off00007209.bin
727aa583a80e412dc8bf8441f644a67b668fec063d99923ada8e2c177de69417		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7209 10728 bytes
font_02_sfnt_off000096a3.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96A3 4324 bytes

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