Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b90143e7a73ea8d…

MALICIOUS

PDF

47.5 KB Created: 2020-08-24 18:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74ec4af688fa1c4208af1ef8f63576b2 SHA-1: 521fb2df6c6298e1b056c2f085ff2b93393a0ffc SHA-256: 1b90143e7a73ea8d07080c44a747aa9c9106c8abfe6237228e8089a6dff38494
120 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, many pointing to Shopify domains hosting PDF documents, but one critical link redirects to a known malicious domain. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=exponential+function+exercises+with+answers', which is a known redirector. This suggests the document is designed to lure users to malicious infrastructure under the guise of educational content.

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=exponential+function+exercises+with+answers
    • http://files.jafleur.com/uploads/1/3/1/4/131408371/3145083.pdf
    • http://files.purfitnesshealth.com/uploads/1/3/1/0/131070993/xupinu.pdf
    • http://files.sfieldphotos.com/uploads/1/3/1/4/131453453/gesoteleno-wijot.pdf
    • https://cdn.shopify.com/s/files/1/0432/0532/9064/files/9426607487.pdf
    • https://cdn.shopify.com/s/files/1/0434/0491/8941/files/elementary_linear_algebra_7th_edition_larson.pdf
    • https://cdn.shopify.com/s/files/1/0454/6274/9334/files/using_games_in_teaching_english_to_young_learners.pdf
    • https://cdn.shopify.com/s/files/1/0429/6930/1151/files/81236663427.pdf
    • https://cdn.shopify.com/s/files/1/0438/4551/7469/files/48970764798.pdf
    • https://cdn.shopify.com/s/files/1/0430/3018/4087/files/english_brushup_6th_edition_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0437/9554/6273/files/11679437296.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/lisiwajux.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/simagenor.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_off00006468.bin
a10f5dad8b8264b7cbdc5afa36ffa68236ad2175f066671ac4d8c4f3be720d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6468 5220 bytes
font_01_sfnt_off0000763a.bin
f56f80037eab465196e42a5518b89981d80b7704af63d742a9812ad7b1cfcb2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763A 10896 bytes
font_02_sfnt_off00009ba1.bin
d05f37f1530d5f93420ec1d1fef03be40ff404ab4da44f5daae16fd0829d120f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA1 16168 bytes

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