Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6798f9dab133fc8…

MALICIOUS

PDF

47.5 KB Created: 2020-08-16 18:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7788df54f176905f42df921c3138d9cf SHA-1: 79f1b825cab68d190c0698f638bef6a0cf1249e0 SHA-256: b6798f9dab133fc8992f77dd93cfac1998d262eaeeb0dcf6de26be011206a4e7
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.cc/pify?keyword=irrational+and+rational+numbers+worksheet+pdf'. The document body, though heavily obfuscated, contains this URL and appears to be a lure for a worksheet. The presence of multiple external PDF links, many hosted on Shopify, suggests a link farm used for SEO poisoning or to obscure the final malicious destination. No scripts were extracted from this sample.

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=irrational+and+rational+numbers+worksheet+pdf
    • http://files.staccounting.co.uk/uploads/1/3/2/7/132740285/663109.pdf
    • http://files.stoneridgevetservices.com/uploads/1/3/0/7/130776150/5541689.pdf
    • https://cdn.shopify.com/s/files/1/0440/6237/6101/files/30931881429.pdf
    • https://cdn.shopify.com/s/files/1/0429/1503/7343/files/1092952182.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/jaferamakopotev.pdf
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/camisa_negra_tab.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9745/files/togapinanoxunadag.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/16235068569.pdf
    • https://cdn.shopify.com/s/files/1/0435/9867/6131/files/gujotop.pdf
    • https://cdn.shopify.com/s/files/1/0431/6413/9669/files/wudusimudigovoburo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6735/9900/files/tafutiginubepitane.pdf
    • https://cdn.shopify.com/s/files/1/0428/9177/2063/files/bakabilivifaxanojax.pdf
    • https://cdn.shopify.com/s/files/1/0435/9946/2558/files/36641858581.pdf
    • https://cdn.shopify.com/s/files/1/0434/3883/3816/files/duvoxisaropamogupak.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/english_grammar_worksheet_for_class_3.pdf
    • https://cdn.shopify.com/s/files/1/0431/0709/0581/files/amazing_grace_my_chains_are_gone_d.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c65.bin
06d927bb2b6daf891478ab4cab90709232d593f7c9b2cc46f53d704c02e6609f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C65 1964 bytes
font_01_sfnt_off000065b3.bin
02b8db35f0d0b062dceea0d5763cc41cf21d4f7e182c73943720fe7237686848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B3 5516 bytes
font_02_sfnt_off0000784c.bin
513469c8d94c0b587cb0dc842b4f2bb8eb09fd6d7e9da48c8ae46fa21fcfee45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x784C 10184 bytes
font_03_sfnt_off00009b1e.bin
f7282090e270060608fdc575ded0b184a97243f724fc845514d2e81390c10c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B1E 16144 bytes

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