Malicious PDF — malware analysis report

Static analysis result for SHA-256 349bc7e4445e44d5…

MALICIOUS

PDF

41.7 KB Created: 2020-08-13 13:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28acecc1788bba427a47f506d1395414 SHA-1: c6a0359f9b87a20e04c9b4a858b61eb3dfbf152a SHA-256: 349bc7e4445e44d5e1165bbdbf898ec10369202672a61ae03f8caf10c4dcc787
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link, https://ttraff.cc/wb?keyword=dbt%20accepts%20skills%20pdf, which is the primary indicator of malicious intent. It also hosts a large number of other PDF links, many of which are benign, suggesting a link farm or SEO poisoning tactic. The document body text, though heavily obfuscated, contains the phrase "Dbt accepts skills pdf", likely a lure to encourage clicks on the embedded malicious link.

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/wb?keyword=dbt%20accepts%20skills%20pdf
    • http://files.bayareazetaplayers.org/uploads/1/3/1/1/131164199/loloz_roseridopi.pdf
    • http://files.kellypretty.com/uploads/1/3/1/4/131406717/9303519.pdf
    • http://files.specchia5-301.com/uploads/1/3/0/7/130776677/gexexosebagobivupika.pdf
    • http://files.nuskillz.com/uploads/1/3/1/3/131380547/zewavejutilav_dusufowazipasov.pdf
    • https://cdn.shopify.com/s/files/1/0439/8638/7102/files/java_swing_full_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0435/2291/6520/files/11007572680.pdf
    • https://cdn.shopify.com/s/files/1/0438/2644/6496/files/bible_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/arte_moderno_giulio_carlo_argan.pdf
    • https://cdn.shopify.com/s/files/1/0439/5050/6152/files/jajubapufijego.pdf
    • https://cdn.shopify.com/s/files/1/0441/1208/5144/files/jewivobazurozijon.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/jomawizirizonenerof.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mosagewenusuwaguxizekud.pdf
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/catalytic_converter_function.pdf
    • https://cdn.shopify.com/s/files/1/0429/9577/7699/files/jorinoloxiboti.pdf
    • https://cdn.shopify.com/s/files/1/0440/1122/5246/files/expression_anglais_franais.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_off000067a7.bin
cbd61984c23f715b68fa43dafab1a9a4880958af80456bf0233a89f78e5ea894
pdf-font-stream PDF embedded font (sfnt) at offset 0x67A7 5256 bytes
font_01_sfnt_off00007994.bin
eb14aedd2cc4744c48546d9dbf1a328671ea1cc2a4630393e96290f466c9455f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7994 9608 bytes