Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6995f35b21b26e1…

MALICIOUS

PDF

51.1 KB Created: 2020-08-29 20:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f76c9ec48fdfc01d100d82001847e21f SHA-1: 205578f33a56f71353853d119bd2a9737a5e7c42 SHA-256: c6995f35b21b26e1121c56ddd335caf8f59e3051ba67457776c0e2632c06a544
152 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 pointing to 'ttraff.cc'. Additionally, another critical heuristic indicates a PDF link farm, with the primary link also leading to a suspicious domain. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting the primary intent is to trick the user into visiting this malicious site.

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.cc/wix?keyword=one+flew+over+the+cuckoo%2527s+nest+chapter+1
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/waxigulazatep.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6605/files/36684345079.pdf
    • https://cdn.shopify.com/s/files/1/0431/1495/4918/files/xigiwu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1910/6461/files/3292172900.pdf
    • https://static.usrfiles.com/ugd/b4a829_f614495d7ddb458c938319e58f336e36.pdf
    • https://static.usrfiles.com/ugd/67f5f7_1a1d34bf3e854714b515f4c39fa06282.pdf
    • https://static.usrfiles.com/ugd/b8c837_607cf5f478734dbaa885c6cc1aadfda5.pdf
    • https://cdn.shopify.com/s/files/1/0433/7201/9877/files/cs_1._6_jetpack_plugin.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/74146825521.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3386/files/bilibili_tv_apk.pdf
    • https://cdn.shopify.com/s/files/1/0437/9534/9661/files/apache_openoffice_for_macbook_air.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b2e3296347541adbc8f1a04cf718a93.pdf
    • https://static.usrfiles.com/ugd/b8c837_449c8b9347844038874b72f085299a9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_449b2338c7df4bd79634cab84a69969d.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_off00007d27.bin
9abbd3b3ab422a37c3b3016562d2d8923c88e46d5b121125fed854be9a120e6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D27 5264 bytes
font_01_sfnt_off00008f36.bin
c76df704241b6be7f197662aea371a03ae34528137e3e48426ed799f0bff3563
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F36 9800 bytes
font_02_sfnt_off0000b0bf.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BF 4324 bytes