Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd638d640ebc408…

MALICIOUS

PDF

49.4 KB Created: 2020-07-16 18:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 3f398c5d8b2d6c603acaccacc54aaf55 SHA-1: cafda0eea1fb89cec138b0bf2bc8550756961e42 SHA-256: 5dd638d640ebc408d440adf6714142163105b79b298e24c22d9c7a6d57f2af1b
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified as a redirector for SEO-based phishing. The document body, though heavily obfuscated, contains text suggesting a lure related to 'implementasi pancasila pdf'. The ML classifier strongly indicates maliciousness, and the heuristics confirm the presence of malicious redirector links and a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wb?keyword=implementasi%20pancasila%20pdf In PDF document text
    • http://files.eagletheatrecompany046.com/uploads/1/3/0/7/130740183/c8059.pdfIn PDF document text
    • http://files.harrydolan.com/uploads/1/3/1/8/131871951/9858780.pdfIn PDF document text
    • http://files.jamesedwardbecton.com/uploads/1/3/1/4/131453350/2714723.pdfIn PDF document text
    • http://files.gathering-of-light.com/uploads/1/3/1/4/131407734/1981766.pdfIn PDF document text
    • http://files.plannedaspects.com/uploads/1/3/1/6/131637385/89f461.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kikibok.files.wordpress.com/2020/07/tukekiwubivugujabibujo.pdfIn PDF document text
    • https://vajokipoz.files.wordpress.com/2020/07/59287710365.pdfIn PDF document text
    • https://lezetasido.files.wordpress.com/2020/07/zukuzepitunimedaparukesob.pdfIn PDF document text
    • https://keganuforuro.files.wordpress.com/2020/07/38125575926.pdfIn PDF document text
    • https://divajavat.files.wordpress.com/2020/07/16929949112.pdfIn PDF document text
    • https://tezufaxaji.files.wordpress.com/2020/06/28703330843.pdfIn PDF document text
    • https://ratekoxon.files.wordpress.com/2020/06/viwedofojuba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2718/5309/files/wifabobomekufexufomefob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/natefelop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3416/4893/files/4277423715.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/19695445240.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/91731707110.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/77447989523.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/rinoxababakufufi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zadolodiwifunum.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8698 4820 bytes
SHA-256: 9967db6c40feba490c5fa8ac26718b9814d5317dfa74605197c376c7d1f1e333
font_01_sfnt_off000096d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96D2 9744 bytes
SHA-256: 0768ca8bc74366fa103c0b891493ae15d072fd5ad2f7a4f6a1d0edbca2adea34