Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd28b4317e549003…

MALICIOUS

PDF

41.6 KB Created: 2020-08-16 11:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2e84725ec3ef39e2f25e6b1f484ad0c SHA-1: a749a12493f1ec83ccc2f03ba1a138b7e9692c23 SHA-256: bd28b4317e54900308f8d4548d3b8649ce99de1a08f0ff074dcea7bccf76dcc9
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure at 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to 'Smartsheet freelance consultant' and the malicious URL, suggesting a lure to a phishing or malware distribution site. 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.cc/pify?keyword=smartsheet+freelance+consultant
    • http://rabinip.livingcanvasmedia.com/uploads/1/3/1/4/131453133/zemafabevuvotef.pdf
    • http://files.indeoacres.com/uploads/1/3/1/4/131409135/1184752.pdf
    • http://vipakom.emugs.org/uploads/1/3/1/3/131380160/5192396.pdf
    • http://files.closetluxeboutique.com/uploads/1/3/0/7/130775297/gififubobokepexuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/lodidabeladejepanawosa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/guzalokimikizodoxakimiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9656/4131/files/mepotaxupofaragefekakewiw.pdf
    • https://cdn.shopify.com/s/files/1/0440/5251/2918/files/70529835704.pdf
    • https://cdn.shopify.com/s/files/1/0435/0532/0088/files/printable_blood_pressure_log.pdf
    • https://cdn.shopify.com/s/files/1/0448/4051/7792/files/how_to_make_a_clicker_heroes_game.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fokukivovasogu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4639/6326/files/4468389371.pdf
    • https://cdn.shopify.com/s/files/1/0439/9611/9198/files/cg_police_admit_card_download.pdf
    • https://cdn.shopify.com/s/files/1/0451/7065/5381/files/10797744218.pdf
    • https://cdn.shopify.com/s/files/1/0435/1095/6196/files/redabiravek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kerikelamizefebimu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1630/files/2776827489.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_off000064b0.bin
a9d7dde94d3f5ad6a48e20dd3e881738288ec96036fa8a118b505aa9c37ef1d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x64B0 5224 bytes
font_01_sfnt_off00007641.bin
e80d99a485cc73eaf78e6ae8184b5be2578ffed36576136a71a9ae3514048bac
pdf-font-stream PDF embedded font (sfnt) at offset 0x7641 10328 bytes