Malicious PDF — malware analysis report

Static analysis result for SHA-256 1948bf293c913fed…

MALICIOUS

PDF

44.0 KB Created: 2020-08-06 22:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 530e2a5132bf54476b04bcda195fbea8 SHA-1: ac5f851222a7f0c1424167a41077b0e68745e0da SHA-256: 1948bf293c913fed2f10dd48df199f9127cf30402dc52d2105fdf0acf0b74f17
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a malicious site. The heuristic firings confirm the presence of malicious redirector links and a link farm, suggesting a phishing or scam attempt. Although no scripts were extracted, the embedded URLs and the nature of the PDF structure point towards a malicious intent to redirect the user.

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=opposed+piston+engine+pdf
    • http://files.seapoda-arpg.com/uploads/1/3/1/4/131408204/5829334.pdf
    • http://files.wardpearsongroup.com/uploads/1/3/2/6/132681647/5723478.pdf
    • http://files.nostalgictreasures.com/uploads/1/3/0/7/130776073/lakuzag_kadax.pdf
    • http://files.symphonyofhawaiianbirds.com/uploads/1/3/0/9/130969312/6109267.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1657/6424/files/fusizadedivuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/lawaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/kiwufopibazuveto.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/wabakabebowufasedi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6098/files/5276094580.pdf
    • https://cdn.shopify.com/s/files/1/0438/3673/5645/files/18279622771.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/vagipe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/52555004017.pdf
    • https://cdn.shopify.com/s/files/1/0432/2649/7182/files/gumujagaxaberifekeluveb.pdf
    • https://cdn.shopify.com/s/files/1/0438/5511/8501/files/nabamabu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2494/0184/files/plstico_biodegradable_hecho_a_base_de_almidn_de_maz.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_off00006fc2.bin
5fcc74d56403e2f72243c6c6b62d4760e4605ea170c4a69632bb1567c597e387
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC2 4896 bytes
font_01_sfnt_off00008083.bin
c588c1d67724120cb526d0ace4e278161fdeddfc3a574ba41de558f63ed1dd7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8083 10136 bytes