Malicious PDF — malware analysis report

Static analysis result for SHA-256 6923d93851169a5f…

MALICIOUS

PDF

43.6 KB Created: 2020-08-21 23:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d971293211512eb812100a74423eae1c SHA-1: c9b52a6823df10d99112d02ef8b51c549bdbc262 SHA-256: 6923d93851169a5fe92306d1d0801860d00a3e5c0c693d45a1b78803788f5b2b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, creating a link farm. One prominent link redirects to a known malicious URL, ttraff.com, which is likely used for further redirection or malicious content delivery. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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=walmart+flannel+bed+sheets
    • http://files.eslboom.com/uploads/1/3/0/7/130776875/xuraw_mulenilunege_pufatar.pdf
    • http://titolipez.xukexclusive.com/uploads/1/3/0/7/130739704/3187326.pdf
    • http://files.nanaimotreeservices.com/uploads/1/3/1/1/131164324/pazas.pdf
    • http://files.nickeltown.org/uploads/1/3/1/6/131636807/zapebivada_mobowobiniref.pdf
    • http://files.didsburyjuniors.com/uploads/1/3/2/6/132681824/maxipupamekep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7583/6840/files/ludaxi.pdf
    • https://cdn.shopify.com/s/files/1/0439/0325/4683/files/necchi_sewing_machine_parts.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6835/files/pozowotemuvinojep.pdf
    • https://cdn.shopify.com/s/files/1/0436/3363/9584/files/zetale.pdf
    • https://cdn.shopify.com/s/files/1/0462/1595/4586/files/75938264511.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/12848165450.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1734/files/free_apache_openoffice_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0428/6113/3990/files/swv_weak_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/4845/1739/files/99211422768.pdf
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/paxujogigen.pdf
    • https://cdn.shopify.com/s/files/1/0437/6422/0055/files/8135060760.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_off00006a68.bin
bcce2116cc51ccdb1981c9e2e5d7d901d0a587ffa638677958a4ada454b896f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A68 5300 bytes
font_01_sfnt_off00007c45.bin
eb58ec3dc286e51ba6975cf1aa724bd4883cd100d5c2ad8ba5def5654ef14372
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C45 10932 bytes