Malicious PDF — malware analysis report

Static analysis result for SHA-256 0908547d09cd3ae7…

MALICIOUS

PDF

37.4 KB Created: 2020-08-16 00:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62d5d679ce03d0127c0a917d8fe06ca8 SHA-1: edac58ac0500777945e39e5bf257eb007509932d SHA-256: 0908547d09cd3ae74416b1b0315d894deeaaa5d8dcc585d66528a8187c63830d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL containing 'faktor jenayah siber pdf'. It also exhibits a PDF link farm heuristic, embedding 26 external PDF links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the embedded links and the nature of the content suggest an attempt to redirect users to malicious sites, potentially for phishing or SEO spam.

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/wb?keyword=faktor%20jenayah%20siber%20pdf
    • http://files.artbywinette.com/uploads/1/3/2/3/132302718/fuxusodu.pdf
    • http://files.thecostumepartyshop.com.au/uploads/1/3/1/0/131071166/28fd38269.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6716/3302/files/jipilu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/pokemon_yellow_cheats_rare_candy.pdf
    • https://cdn.shopify.com/s/files/1/0432/4275/0114/files/apexogenesis_journal.pdf
    • https://cdn.shopify.com/s/files/1/0437/9593/9488/files/87911606295.pdf
    • https://cdn.shopify.com/s/files/1/0438/3513/0018/files/70221430635.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/zetinexiwuzejodegawig.pdf
    • https://cdn.shopify.com/s/files/1/0437/4472/3098/files/rafatujopikojisotakojaxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/8719/0430/files/85145530175.pdf
    • https://cdn.shopify.com/s/files/1/0434/2520/2325/files/kigemugakif.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5744/files/masegafivirax.pdf
    • https://cdn.shopify.com/s/files/1/0430/2084/5210/files/time_calculator_ps4.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_off00005651.bin
23c3b1ba900384f9d967405f289d61c1e42f655c5994f7a0f640cc28dcb41437
pdf-font-stream PDF embedded font (sfnt) at offset 0x5651 5432 bytes
font_01_sfnt_off000068d1.bin
baaa754cd5332fb318dbf3a9d549cefa4689aee70cf5cd117fba320195ab63d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x68D1 9484 bytes