Malicious PDF — malware analysis report

Static analysis result for SHA-256 6397062cdb9a7403…

MALICIOUS

PDF

42.1 KB Created: 2020-08-03 22:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ad09c6ba9a5ff8348b7416e44407e91 SHA-1: 3dadddb2413da9c3e71f573419dc91babde6b66c SHA-256: 6397062cdb9a74033edbb367ca4b428c821e549d4c4cc2fc148f3289d35b5843
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector service, identified as malicious. This redirector is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains text related to '10th grade math worksheets with answers pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous other PDF links further indicates a link farm used for SEO poisoning or distributing malicious content.

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=10th+grade+math+worksheets+with+answers+pdf
    • http://files.alaalohagirlsstate.org/uploads/1/3/1/4/131483148/musajorudubeve_xalabemezego_rudelezu.pdf
    • http://files.weavermotorsportsinc.com/uploads/1/3/1/4/131407977/7a769de.pdf
    • http://files.pandakungfucenter.com/uploads/1/3/2/6/132695639/xageraw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/57478693940.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/fagitemelibutisatidizuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/5356/2526/files/nijamulepodabiman.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/wifomokebi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5453/0709/files/rabofopinometunexo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/36077978479.pdf
    • https://cdn.shopify.com/s/files/1/0428/2767/7852/files/48995766622.pdf
    • https://cdn.shopify.com/s/files/1/0431/1308/7142/files/62197174320.pdf
    • https://cdn.shopify.com/s/files/1/0434/7677/9174/files/56628016258.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/17247629001.pdf
    • https://cdn.shopify.com/s/files/1/0436/5352/9753/files/82668800267.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9789/files/1728008441.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1321/files/wow_fight_club.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_off000065df.bin
2b3613f831dba983fc5352a15708ec16365a233c52c4dac0b7acfbd771476112		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65DF 5680 bytes
font_01_sfnt_off00007926.bin
df3f51225c65cfca301189593382fa4267d74e1e242fb03ef1b1884256d40e6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7926 10108 bytes

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