Malicious PDF — malware analysis report

Static analysis result for SHA-256 078a66e6e967bf9d…

MALICIOUS

PDF

57.1 KB Created: 2020-07-31 14:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61005d9df4396b13bae192d5f2aee458 SHA-1: c7424a14bcb7a040c6ea0311e9d536f51bfa7a91 SHA-256: 078a66e6e967bf9d4ae29db68cd9f32b654ad2c5669d15109fb46362b14fa1a5
154 Risk Score

Malware Insights

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

The PDF contains a link farm and redirects to a known malicious URL, indicating an attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. Although no scripts were extracted, the presence of numerous external links, including one to a known malicious redirector, suggests a phishing or SEO manipulation 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.ru/pify?keyword=apnea+obstructiva+del+sue%25C3%25B1o+y+anestesia+pdf
    • http://files.susanljohnsonart.com/uploads/1/3/1/3/131384335/veninakegaxawozalufu.pdf
    • http://files.marlobarrera.com/uploads/1/3/1/4/131437157/80ea42e065628.pdf
    • http://files.coachingandcounsellingottawa.com/uploads/1/3/1/6/131606257/1941667.pdf
    • http://files.mrscooke.com/uploads/1/3/0/8/130873851/zuzatesajanom-lujofaden-togizuka-bofekepejeresif.pdf
    • http://files.foundationforhopeinafrica.org/uploads/1/3/1/8/131872096/mimemirerabopew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6412/1752/files/tifusumenizemebula.pdf
    • https://cdn.shopify.com/s/files/1/0434/3008/4760/files/porifulugapefano.pdf
    • https://cdn.shopify.com/s/files/1/0432/3491/8558/files/73879680280.pdf
    • https://cdn.shopify.com/s/files/1/0435/4277/3914/files/papumusadesisiresovajoniz.pdf
    • https://cdn.shopify.com/s/files/1/0437/5658/5121/files/35252911995.pdf
    • https://cdn.shopify.com/s/files/1/0437/4459/2021/files/vojimagisumutawur.pdf
    • https://cdn.shopify.com/s/files/1/0434/1058/7800/files/pemoritirudaxadigana.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/41164058616.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuketunaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/24184395791.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_off00009d6d.bin
905f98576a81a9b4f544a38bb7fa530ebd033446af9af0675f2da27a43f20702
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D6D 5532 bytes
font_01_sfnt_off0000b003.bin
fe09d5af7ca5aebc08cc6f021868f22924706958419542ae66e2e9143bd7c42c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB003 11236 bytes