Malicious PDF — malware analysis report

Static analysis result for SHA-256 57dc08fa923149cd…

MALICIOUS

PDF

43.7 KB Created: 2020-08-08 15:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d561b1373410125b7c5e2a3908699fa SHA-1: 007cd2d037cf45291fb445f5617b091d0738c9f8 SHA-256: 57dc08fa923149cdaef3dd187c5425284c08e7f408401f058461bf690d009fe3
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains. The primary malicious URL is a redirector that appears to be disguised as a link to 'past simple regular verbs exercises worksheets'. The presence of multiple Shopify links suggests an attempt to obscure the malicious destination or leverage seemingly benign domains for distribution.

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/wb?keyword=past%20simple%20regular%20verbs%20exercises%20worksheets
    • http://files.triglavpark.com/uploads/1/3/1/4/131453111/1083897.pdf
    • http://files.atlantadentalanesthesia.com/uploads/1/3/1/4/131455883/najikenusapijevofifu.pdf
    • http://files.danielmckeon.net/uploads/1/3/1/4/131438180/7565198.pdf
    • http://files.cleanfieldproducts.com/uploads/1/3/1/3/131379578/1860198.pdf
    • http://files.cpabonjewelry.com/uploads/1/3/0/9/130969018/lejiluzuk-zafajej-fudozevomefe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/cricket_phones_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/63993153491.pdf
    • https://cdn.shopify.com/s/files/1/0427/4946/0636/files/nutakumedupofub.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4154/files/velafisilaguz.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/80617092479.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/65130715411.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/sagogurirazabokuramiwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/8439/9270/files/nobazakejeroroxodevavi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8060/5077/files/carboxylic_acid_reactions_summary.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/16625140795.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/free_chess_books_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5751/files/bhagwat_geeta_book_in_english.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_off000057f4.bin
6f2ebde9a978679b272d566edf997fe403f082bae818f79a6ca7ea764acc84e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x57F4 5772 bytes
font_01_sfnt_off00006b83.bin
0aef5c3e485959073a38c74323cdd324e352f94c125fb3981b45f5a2aa5c624e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B83 9556 bytes
font_02_sfnt_off00008c85.bin
313c3940a6f4aae92ceaa1b1a843de6e6f13411355a457aba6e018c383fce54c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C85 16060 bytes