Malicious PDF — malware analysis report

Static analysis result for SHA-256 392977372d69351b…

MALICIOUS

PDF

58.7 KB Created: 2020-09-01 03:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4bad3fcf63fdeff2df21d8e005f86c7 SHA-1: e64d3be6bb643a43c221bb059a3f5c5afbcb8504 SHA-256: 392977372d69351b5f333e84261cae7eecd46868d6f5a8634719e41591e72d63
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 'https://ttraff.com/wix?keyword=types+of+lexical+meaning+pdf'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains this URL, suggesting a social engineering lure. The ML classifier also strongly indicated maliciousness.

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=types+of+lexical+meaning+pdf
    • https://cdn.shopify.com/s/files/1/0428/7964/7903/files/banusik.pdf
    • https://cdn.shopify.com/s/files/1/0437/2440/6933/files/naxabajixi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9644/files/4167692040.pdf
    • https://cdn.shopify.com/s/files/1/0430/3002/0247/files/68487192950.pdf
    • https://cdn.shopify.com/s/files/1/0428/6690/1148/files/91178480632.pdf
    • https://cdn.shopify.com/s/files/1/0447/6072/7703/files/subcontractor_agreement_template_nsw.pdf
    • https://cdn.shopify.com/s/files/1/0435/4765/6343/files/81473001255.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/80556420219.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/71579456860.pdf
    • https://static.usrfiles.com/ugd/3f4b99_218c1294cdce4cf985510db813d8ac33.pdf
    • https://static.usrfiles.com/ugd/0d089b_3e7d8f28abc94cf1bc731dc486bbc73e.pdf
    • https://static.usrfiles.com/ugd/a18aa6_485e28ae89154cb7be21528cc82b16f3.pdf
    • https://static.usrfiles.com/ugd/314c35_9b43c141b7bf4789a7a686eb33872210.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_869ca8e3d5d64cfebbfd156072fd40bd.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6074/files/pearson_ap_biology_review_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/32102080011.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_off0000a7e4.bin
a61e6fb005c76568a7dfb7e5c6f88eeeb9252448b1e4484541626ad406374471
pdf-font-stream PDF embedded font (sfnt) at offset 0xA7E4 5496 bytes
font_01_sfnt_off0000ba9d.bin
e8ea8a3ee85804f0a2f183960938f5f2895a846e8842bc5c0981b844d4933c27
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9D 10328 bytes