Malicious PDF — malware analysis report

Static analysis result for SHA-256 89925dc4b85a34f2…

MALICIOUS

PDF

50.2 KB Created: 2020-08-29 18:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c42486d20e03a307729137d1818e1b5c SHA-1: bb67b5f67c3f901d59ec605fd79568f410989079 SHA-256: 89925dc4b85a34f29768661340bba30ce2dde0cf655dd18ffe9d7197b4820625
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links, however, directs to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for users to click on these links.

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=antonimo+de+oral
    • http://www.antonimos.net/oral
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7564/9180/files/what_is_systematic_random_sampling.pdf
    • https://cdn.shopify.com/s/files/1/0430/9365/5716/files/madurutujisegubizufugol.pdf
    • https://cdn.shopify.com/s/files/1/0439/9559/4910/files/59184540974.pdf
    • https://cdn.shopify.com/s/files/1/0430/7625/5897/files/mopozagudiwoni.pdf
    • https://cdn.shopify.com/s/files/1/0450/6225/8851/files/banting_red_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/90952212836.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2297/files/33522729292.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/tekupe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4099/files/zukurupifusol.pdf
    • https://cdn.shopify.com/s/files/1/0439/8402/7806/files/wivopule.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3397/files/pimuxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3571/files/1698697842.pdf
    • https://cdn.shopify.com/s/files/1/0433/0382/9657/files/jawbone_big_jambox_manual_reset.pdf
    • https://cdn.shopify.com/s/files/1/0466/6959/4789/files/95593997826.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086c3.bin
4c9d81ac751e4a6ece82df2ebfe7ea15bfe10d58fe55b1081cd7212d47685c58
pdf-font-stream PDF embedded font (sfnt) at offset 0x86C3 4780 bytes
font_01_sfnt_off000096df.bin
28238e54e88509fa0219e5183f021d819bfbe25dc6d5472a5a365f239d1f81d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x96DF 11584 bytes