Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab5e98b972e62d3…

MALICIOUS

PDF

44.0 KB Created: 2020-08-11 15:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf1b653df428ff1c6d185956b3e2d31c SHA-1: 38c3e43be49812dcf9436f14a5bdebadbe16af20 SHA-256: 0ab5e98b972e62d31dc89b3382fcd68eb031ec938548f651bac59c3d192ba310
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure related to medical procedures, combined with the authoring application name, suggesting an attempt to disguise malicious content. The presence of multiple PDF links, many hosted on Shopify, indicates a potential link farm used to distribute 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.com/pify?keyword=penatalaksanaan+jantung+koroner+pdf
    • http://nibape.reddotplayers.com/uploads/1/3/1/4/131453574/joxibufojef.pdf
    • http://files.misfitcrusaders.com/uploads/1/3/0/8/130814672/634f8e.pdf
    • http://files.annarbormothertree.com/uploads/1/3/1/4/131483138/e350c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6348/4315/files/50273806270.pdf
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/24303531043.pdf
    • https://cdn.shopify.com/s/files/1/0430/5738/1530/files/all_awards_2020_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/tesujoxikuxavaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9863/files/10208251635.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/28404666642.pdf
    • https://cdn.shopify.com/s/files/1/0430/2520/3354/files/bosakol.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3909/files/sap_accounting_module.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/nekokuwu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2086/9019/files/78261543550.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/joxotukufonekozaxigipukix.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_off0000613a.bin
7cd13a01ddc93bbf668c4846eb596cd1303721660bae4a85fb2a12cf7277e80a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613A 5184 bytes
font_01_sfnt_off000072ef.bin
42a6ea9d7121fed24ef205c43d47e5b229809ee6226843d53f93f8be42996c84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72EF 9916 bytes
font_02_sfnt_off000094d8.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94D8 4324 bytes

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