Malicious PDF — malware analysis report

Static analysis result for SHA-256 87007eb7fd6c224d…

MALICIOUS

PDF

51.7 KB Created: 2020-08-07 23:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 714c7a4068248578971930c075307f95 SHA-1: 0cf7719bec251b6dc719b4b084fc0f9a7722313d SHA-256: 87007eb7fd6c224d91232c4a342529fb3a0033bf911b4460c2532d08dd39c0af
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though partially obfuscated, includes the same URL, suggesting a lure to a malicious site. The presence of embedded links and the heuristic firing for a malicious redirector indicate a phishing or redirection attack. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=anemia+hemolitik+autoimun+adalah+pdf
    • http://files.karlabeattyart.com/uploads/1/3/1/8/131872032/gapuwimodo-xasuvumogarat-dazezuwaligo-nawiw.pdf
    • http://files.sprinklermasterrepair.com/uploads/1/3/1/4/131438389/ef4170040736a0.pdf
    • http://files.art4himstudios.com/uploads/1/3/0/8/130874647/nopalu_mebovabo.pdf
    • http://files.bibrigade.org/uploads/1/3/0/7/130775563/949595.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/79999047892.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/zifig.pdf
    • https://cdn.shopify.com/s/files/1/0435/9382/6463/files/lomitapaluwam.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/rogiwipez.pdf
    • https://cdn.shopify.com/s/files/1/0433/8624/1187/files/national_commission_for_scheduled_castes.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/47828649362.pdf
    • https://cdn.shopify.com/s/files/1/0433/3063/3881/files/action_figure_price_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0310/8768/files/wiimote_pin_finder.pdf
    • https://cdn.shopify.com/s/files/1/0428/7175/0823/files/1420155704.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/mejuke.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/navy_nonresident_training_course.pdf
    • https://cdn.shopify.com/s/files/1/0435/9618/5763/files/subject_verb_agreement_in_inverted_sentences.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008086.bin
92ddae8142a307e107e4edca32880894f48cbf813698b521531ac89e733dc245		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8086 4940 bytes
font_01_sfnt_off00009122.bin
51c930c117567389efb93da1a92a0daa6393e016f6dbe57619370ed33eb9c448		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9122 10032 bytes
font_02_sfnt_off0000b367.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB367 4324 bytes

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