Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1a9a3af63d2364…

MALICIOUS

PDF

42.5 KB Created: 2020-08-25 10:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fae98603776861d07295b55a3334e0c SHA-1: 18ac22e23ea29b3ca743348271622fc1a731a7cb SHA-256: 4c1a9a3af63d23648c51204bdc65d27f74309f3111025c89f784300fdeb17167
150 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, directing users to 'https://ttraff.com/pify?keyword=family+dynamics+therapy+worksheets'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files, many hosted on cdn.shopify.com. The document body, though heavily obfuscated, also contains the primary malicious URL, suggesting a lure to a potentially malicious site disguised as therapy worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=family+dynamics+therapy+worksheets
    • http://files.liic.org/uploads/1/3/0/7/130738719/tasowog.pdf
    • http://rumun.privatecounsellingandmediation.com/uploads/1/3/0/7/130775565/6f575.pdf
    • http://zajovaj.valleyautoservice.net/uploads/1/3/1/4/131453041/87c5a.pdf
    • http://files.fredkaplanbiographer.com/uploads/1/3/1/8/131856232/zipitekusa.pdf
    • http://vevun.floydtribute.com/uploads/1/3/2/7/132741334/6081524.pdf
    • https://cdn.shopify.com/s/files/1/0434/5636/4709/files/chromogenic_substrate_coliform_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/zatopunajije.pdf
    • https://cdn.shopify.com/s/files/1/0434/7107/7526/files/38477410170.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/95199936216.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/fotuduvibifoxifukib.pdf
    • https://cdn.shopify.com/s/files/1/0440/7663/0181/files/bascom_avr_book.pdf
    • https://cdn.shopify.com/s/files/1/0438/3303/2864/files/centos_firewall_open_port.pdf
    • https://cdn.shopify.com/s/files/1/0430/4224/2709/files/mulezasapirid.pdf
    • https://cdn.shopify.com/s/files/1/0430/5446/5175/files/9579851397.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7584/files/47370854021.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51031200676.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/32696273878.pdf
    • https://cdn.shopify.com/s/files/1/0434/2638/1975/files/vusifoxowozefoxegir.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/57268631060.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_off000067c3.bin
9348e7216c204409b3583e65dbaad89dc3df01114d5bef2a9fc70cb9eb766d93
pdf-font-stream PDF embedded font (sfnt) at offset 0x67C3 5528 bytes
font_01_sfnt_off00007a71.bin
69c5ba94977807b401cf3ff97196abd1e93fcddcc37de388bdee2c8b8f0ed284
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A71 10132 bytes