Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec5e34ff4f1d72c…

MALICIOUS

PDF

45.2 KB Created: 2020-07-30 21:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec8c2c8066b8f612f063be3f69fed39b SHA-1: 0e81f7aa5782c543e3303620174ddc82bc59fb35 SHA-256: 4ec5e34ff4f1d72c6b15f0795b714760fe65d508b0859f480f5d0e60448c1135
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a Southwest Airlines logo, indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Southwest airlines logo pdf'. The presence of numerous external PDF links, many hosted on Shopify, points to a link farm strategy, likely to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=southwest+airlines+logo+pdf
    • http://files.candgsales.com/uploads/1/3/1/6/131606745/rasos-kirabojero-tasutosafit.pdf
    • http://files.sorrentosak.com/uploads/1/3/0/7/130776037/37a30c3.pdf
    • http://files.florianmayneris.ca/uploads/1/3/2/8/132814220/judavi.pdf
    • http://files.firesidetech.net/uploads/1/3/1/1/131164032/9659914.pdf
    • http://files.how2productions.co.uk/uploads/1/3/1/4/131406434/a55b7d6.pdf
    • https://cdn.shopi
    • https://cdn.shopify.com/s/files/1/0440/8157/8136/files/58820101243.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/33037178045.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8902/files/95722430682.pdf
    • https://cdn.shopify.com/s/files/1/0440/8328/2070/files/nosixafusizorujo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kewosa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0985/8984/files/rurebida.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0056/files/71542881768.pdf
    • https://cdn.shopify.com/s/files/1/0440/9108/0869/files/10963448630.pdf
    • https://cdn.shopify.com/s/files/1/0440/2806/7990/files/96554645835.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/60553529400.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0011/files/90203682430.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_off000071b6.bin
fc1d92694d657e052da7e2231af39f83470b9a7dafbbdf8a6202352beec345d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x71B6 5380 bytes
font_01_sfnt_off00008408.bin
e3323b5d24e2309c321a1e8ecd168145697257a88e9cd411be976121d700b2e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8408 10404 bytes