Malicious PDF — malware analysis report

Static analysis result for SHA-256 827b6fd4d2d561e9…

MALICIOUS

PDF

43.3 KB Created: 2020-08-22 19:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70cf332bca5d6aae7c9ce9ef41b87274 SHA-1: 9f96c5cd4ce74c68f0cf229be709dafce260f09a SHA-256: 827b6fd4d2d561e9ed282e6b19a9fc78ad54fe2b7890d967aa764400f5bb51a7
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 pointing to 'https://ttraff.com/pify?keyword=free+subtraction+worksheets+for+grade+2'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to Shopify domains. The document body, though partially corrupted, contains text related to 'free subtraction worksheets for grade 2', suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing attempts.

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.com/pify?keyword=free+subtraction+worksheets+for+grade+2
    • http://files.septemberkrueger.com/uploads/1/3/2/6/132682630/tumatafaxog.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/beamforming_technology.pdf
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/pakewi.pdf
    • https://cdn.shopify.com/s/files/1/0439/5696/1438/files/77365223220.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/12365562947.pdf
    • https://cdn.shopify.com/s/files/1/0429/6520/5141/files/alcoolisme_chronique.pdf
    • https://cdn.shopify.com/s/files/1/0428/4488/1059/files/burford_capital_annual_report_2013.pdf
    • https://cdn.shopify.com/s/files/1/0437/3407/3505/files/les_bases_de_l_anthropologie_culturelle.pdf
    • https://cdn.shopify.com/s/files/1/0437/9141/7495/files/xabexupibo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2110/files/bojetixokisav.pdf
    • https://cdn.shopify.com/s/files/1/0438/2454/5949/files/zidasewugomosovipatalule.pdf
    • https://cdn.shopify.com/s/files/1/0434/0236/3045/files/61649375148.pdf
    • https://cdn.shopify.com/s/files/1/0437/1483/8679/files/wizanawaso.pdf
    • https://cdn.shopify.com/s/files/1/0438/9535/7595/files/caloric_value_of_food.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_off000069db.bin
235b624df2d59cdffb14b3569cc3d04ebfd8f55d4d725510dc117851b1c43863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69DB 5636 bytes
font_01_sfnt_off00007d0d.bin
fa84ef502bf3f6fa1eeb17952dbc610415eb820aa198e580c2cb2a2c34849010		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0D 10456 bytes

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