Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db16f3e532a9288…

MALICIOUS

PDF

48.2 KB Created: 2020-08-30 07:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d80ee88ef405f95ee4cdf82dfe84c24b SHA-1: 2975084b3df17b4a8f25a82c91bd727defb7d49c SHA-256: 3db16f3e532a9288b74291ad092ca76e3e0cbc85242b820edde93ec9397c275a
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, another critical heuristic indicates the PDF is part of a link farm, suggesting a broad distribution effort. The ML classifier strongly flagged this PDF as malicious. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download 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.com/wix?keyword=situacion+didactica+de+navidad+para+ni%25C3%25B1os+de+preescolar
    • https://static.usrfiles.com/ugd/b8c837_b17ce93c91c3442898b4e0ee7fd53639.pdf
    • https://static.usrfiles.com/ugd/b8c837_58fdfc4a8f1b44278fbdad7c90667232.pdf
    • https://static.usrfiles.com/ugd/3e87bf_1d0d859c5b8d459da2ad2abcd72712ba.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/84297975959.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/54368669934.pdf
    • https://cdn.shopify.com/s/files/1/0430/6327/9767/files/xixadufog.pdf
    • https://cdn.shopify.com/s/files/1/0438/0773/5969/files/gradle_test_report_empty.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6457/files/52935810267.pdf
    • https://cdn.shopify.com/s/files/1/0431/6594/1917/files/47906739882.pdf
    • https://cdn.shopify.com/s/files/1/0436/9983/0952/files/21447725408.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/iec_standard_60529.pdf
    • https://static.usrfiles.com/ugd/fb83f1_cb31cc4922b54f5ab5db45d7b5428bc2.pdf
    • https://static.usrfiles.com/ugd/10b11f_c882dbd6446d4ceea4ff60771c122cfa.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1b6dd5e34a34c318935621fec93e880.pdf
    • https://static.usrfiles.com/ugd/b8c837_684aa52f1b41443ca46dc2677abb7ac2.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_off000079de.bin
2543de3d8f4a8858b36d3e3f608e630808196559f792910b3ddea522d0e7421e
pdf-font-stream PDF embedded font (sfnt) at offset 0x79DE 5440 bytes
font_01_sfnt_off00008c21.bin
7d015424a767efe3c8a3ed345f881d27c8f2bd25416f76322971c908bcabfa56
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C21 11456 bytes