Malicious PDF — malware analysis report

Static analysis result for SHA-256 d909c4f12ee538da…

MALICIOUS

PDF

42.9 KB Created: 2020-08-20 04:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eba75acde404faec10f7d69e11d4a11b SHA-1: 8ac79a640fbeb322552eed73fe39a615e951ccfc SHA-256: d909c4f12ee538dab02c6551cf9bd507c8fca546b7eb475e31f09e248c0fce6b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to a known malicious redirector. It also exhibits a PDF link farm behavior, with numerous external links, including 15 generated SEO PDF links. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content. No scripts were extracted from this sample.

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.cc/pify?keyword=attribution+rules+tax+reform
    • http://files.nanarobindesigns.com/uploads/1/3/1/4/131437724/mipegaxuzewasaf.pdf
    • http://pemuf.marciasesthetics.com/uploads/1/3/1/8/131856190/35df99.pdf
    • http://files.longridgemusic.com/uploads/1/3/1/4/131407974/figirupu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3781/files/datasheet_view_access_2010.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/24053633510.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/fakuwomapod.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/tupezemitipa.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/all_animals_name_with_picture.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9348/files/isometric_abdominal_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0876/files/kiseposexojanuto.pdf
    • https://cdn.shopify.com/s/files/1/0437/4917/9541/files/61056838961.pdf
    • https://cdn.shopify.com/s/files/1/0437/0923/5355/files/alarma_de_lluvia_pro_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/android_studio_offline_gradle_sync.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006894.bin
35506bc7707cdf689574a50c1b9a1fb4883e6bd5396a5df7b7fc4dd8d3eda360
pdf-font-stream PDF embedded font (sfnt) at offset 0x6894 5112 bytes
font_01_sfnt_off000079e1.bin
4dee26aacb4ef824d490a0a8b711371389edcefca7bff9bc2e471e9785922e95
pdf-font-stream PDF embedded font (sfnt) at offset 0x79E1 10712 bytes