Malicious PDF — malware analysis report

Static analysis result for SHA-256 1062ca45a5816576…

MALICIOUS

PDF

43.5 KB Created: 2020-08-05 03:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b5d2ac6abd5a0c6dec4a9aaf0e1b749 SHA-1: bb9318d02ea271035401334c310e996a37782656 SHA-256: 1062ca45a58165761ad5754d8720f3a44fe5cfd062038e2d6f1c51b46bc6072e
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as an answer key that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_LINK_FARM heuristic suggests the document is part of a larger link farm, likely for SEO manipulation or to distribute malicious content. While no scripts were extracted, the embedded link is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

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=casey+at+the+bat+answer+key+pdf
    • http://files.brainspaceclassroom.com/uploads/1/3/0/9/130969346/jewaxawoxamo_suruxefodako_kumibo_rukobe.pdf
    • http://files.himalayanadventures.net/uploads/1/3/0/7/130776366/tineragezenav-dataruduf.pdf
    • http://files.headquartersco.com/uploads/1/3/2/6/132681501/27d1728b344ca.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/8345/4872/files/pegolowixizafu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/mudibulukasenijidenukiki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/kajodelukufunarufipusobe.pdf
    • https://cdn.shopify.com/s/files/1/0447/9008/7829/files/calendario_novembre_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/sewopewodolirutozefa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/sidinutuxadajerosabunofo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/55860745140.pdf
    • https://cdn.shopify.com/s/files/1/0434/1714/1415/files/tarobugo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6910/3528/files/manual_j_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0428/6011/8175/files/apprendre_a_programmer_python_3.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_off0000617c.bin
c7a3f657761dd54921c6b8c89248ec9b57b4f049fb2c34952cd962aed2815486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x617C 5148 bytes
font_01_sfnt_off000072f5.bin
dcdd3e800090754bd408f889711e349bae371803e5a52d52308f0e70c2773f56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F5 9332 bytes
font_02_sfnt_off000092d7.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92D7 4324 bytes

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