Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90476b925e79125…

MALICIOUS

PDF

44.7 KB Created: 2020-08-17 17:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8631c507ff7f85c8cfe2581380147fd SHA-1: 6579aa15cad430f5ca19d95bd3bb8d139cb9a5d0 SHA-256: e90476b925e791257407f26a5eb3538092041ca35fc1d838db3274298b51a89b
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains text related to performance appraisals, suggesting a social engineering lure. The presence of numerous other links, many hosted on Shopify, indicates a link farm designed to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious.

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=performance+appraisal+samples+for+supervisors
    • http://nuwapo.oraclefitness.com/uploads/1/3/2/7/132740519/3c69c3ce18e.pdf
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/17339214188.pdf
    • https://cdn.shopify.com/s/files/1/0433/4131/6249/files/46422185271.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xugifewelogukepebokiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9977/4366/files/torigawufumopimefagudi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4339/6506/files/apache_hadoop_yarn.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2711/files/74822063191.pdf
    • https://cdn.shopify.com/s/files/1/0431/3579/5354/files/lumojoneme.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/47041942521.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/bewunig.pdf
    • https://cdn.shopify.com/s/files/1/0433/9934/8389/files/pulotofukamupedemitepi.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_off000064a8.bin
6ae6a2575516f8272f3314485c08c88c8e1d6caa246eb3e6a52be04b78df1cee
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A8 5024 bytes
font_01_sfnt_off0000759a.bin
ddccbdb507923f6a25f921441fe116352bf1abc81bc99b202740ff697809afcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x759A 10068 bytes
font_02_sfnt_off000097b7.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x97B7 4324 bytes