Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b32ff453890ad5…

MALICIOUS

PDF

38.9 KB Created: 2020-08-02 23:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef9595894365168066e8258fb9062c48 SHA-1: a970dc7396c2cf76dd9cd58496a8a56bcf76f729 SHA-256: 03b32ff453890ad5b2846ffa1e2210fcc69d5503660a42e545eec633b9480d61
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are likely part of a link farm or phishing campaign. No scripts were extracted, but the presence of numerous links suggests an attempt to redirect users to malicious sites.

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=tigershark+jet+ski+manual
    • http://files.webcamgreece.com/uploads/1/3/1/6/131606087/xidonumajegiluse.pdf
    • http://files.strausorganizingsolutions.com/uploads/1/3/2/7/132740464/kapin-zamasobexijozaw-mamoruf.pdf
    • http://files.a-r-a.org/uploads/1/3/2/6/132680922/wonojoralesa-fosome-pawofi-buxojixomeniko.pdf
    • http://files.shotoryujutsukarate.com/uploads/1/3/0/7/130776246/3c335eb72a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/gexurilowenajafobiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/7341/4055/files/sawufipog.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1616/files/valivutuxokomag.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/xirutosu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9256/files/68659020021.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/volanavago.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/72095837147.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/gezesonisavowiga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41718344304.pdf
    • https://cdn.shopify.com/s/files/1/0434/6255/7856/files/rofonemo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/ssd_of_two_arrays_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/35900838225.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_off000054cd.bin
08530dcb841b001010bf85d28e1a27129c71fd6197b3fca48ee3f9962cb440e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54CD 5188 bytes
font_01_sfnt_off00006653.bin
4b3737ec6b97ec0916064eb3703446f881fe84bdc5d60a44a60a009562d5b7ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6653 12724 bytes

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