Malicious PDF — malware analysis report

Static analysis result for SHA-256 80bf3a945022bbf1…

MALICIOUS

PDF

34.6 KB Created: 2020-08-12 12:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f451c38f24336177bb269588f8c6c8d1 SHA-1: 556d3421d6e620ec98c2482032d93bd1164c9c04 SHA-256: 80bf3a945022bbf18345e26998dfa8593a3421256ed58ac7f259bd553cbbc67d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The primary attack pattern appears to be SEO spam or phishing, leveraging numerous links to potentially malicious or deceptive content. No scripts were extracted, but the presence of embedded URLs suggests a redirection-based attack.

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=invertebrate+zoology+anderson+pdf
    • http://files.columbiadentcenter.com/uploads/1/3/0/9/130969910/jubegonakajij-desagomabof-sateno-pikilolot.pdf
    • http://files.nerdgonerogue.org/uploads/1/3/2/7/132740399/13171.pdf
    • http://files.parklandpacificdental.com/uploads/1/3/1/4/131408537/rigedewaxek-dunodovopoka-radit.pdf
    • http://files.jhepta.org/uploads/1/3/0/7/130739693/kakatovepawoxer.pdf
    • http://files.elkhornvalleyhrc.com/uploads/1/3/0/7/130775466/f328c8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2977/3981/files/domawiwutiwefevo.pdf
    • https://cdn.shopify.com/s/files/1/0441/4255/9384/files/altistart_48_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/3183/8368/files/daddy_yankee_limbo_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0438/9512/8216/files/mavelawipobunoduxesur.pdf
    • https://cdn.shopify.com/s/files/1/0449/0749/5591/files/62747994733.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65022979336.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4454/files/catalogo_placche_axolute_bticino.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/66136176393.pdf
    • https://cdn.shopify.com/s/files/1/0432/5533/3027/files/bacterial_biocontrol_agents.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/5th_grade_math_volume_worksheets.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_off0000487b.bin
3e0de6a025a762b8935cec8942b186416bd9984320b7e9f851195e1f797c22ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x487B 5500 bytes
font_01_sfnt_off00005b47.bin
580c28655a8e60e69f34c6a3f2b05f720fc380be137a1aca15d9a1fc58d4b823
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B47 10072 bytes