Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a85b01bb138e4a…

MALICIOUS

PDF

46.0 KB Created: 2020-08-14 14:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90237f536ff5d7285195e9a29e2a6aac SHA-1: 3c0a4aee3514d01f3e148aa2f3938dc3af0ab2b6 SHA-256: 18a85b01bb138e4a3642b19ded34531866ef47381d106344981c03af4ba23fd3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. This suggests the document is designed to lure users to malicious websites, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=apush+historical+thinking+skills+worksheet
    • http://files.iwagy.org/uploads/1/3/1/4/131407281/rodibapipoxe_fojilejifetisi_kovorozunitoxa.pdf
    • http://files.elspethcarroll.com/uploads/1/3/0/8/130874058/jevukojejololok.pdf
    • http://mugujev.ripolleslab.com/uploads/1/3/1/3/131383483/falijaxajez_diturugibepovin_xujurevetis_gekilewulavise.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8578/1397/files/lafufezopekegidafuwusowu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49181926903.pdf
    • https://cdn.shopify.com/s/files/1/0433/9479/3635/files/fusion_kodi_2016.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/composition_centsimale.pdf
    • https://cdn.shopify.com/s/files/1/0436/9540/7269/files/briggs_and_stratton_engine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/0017/4504/files/somisufeto.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0432/7522/3200/files/89208122680.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0046/files/41945468284.pdf
    • https://cdn.shopify.com/s/files/1/0435/1157/8776/files/jojafaburunabelezebala.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/71838099404.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000616e.bin
d211f33df23430cd790172521d3cd5ad3d6bbfe4387839195e90f0bceed70a94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616E 5340 bytes
font_01_sfnt_off000073a1.bin
4a5f67c88355b8e80970fbac004c7b7492f9882e1ecbe9561043404153b34334		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A1 10052 bytes
font_02_sfnt_off0000960d.bin
bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x960D 16060 bytes

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