Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3227698b255b06…

MALICIOUS

PDF

45.9 KB Created: 2020-08-10 13:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2883f7cd8e910869070962a969aaa0cc SHA-1: b7a4125b6b5ec99a09e4dd89eb08d42a98597027 SHA-256: 5a3227698b255b06fb84aa46878cb17bdb671f3d4de1621df4e922b43946a112
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector, suggesting an attempt to trick users into clicking it. The presence of numerous external links, including a malicious one, indicates a likely attempt to redirect users to malicious content or phishing pages.

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=estratifica%25C3%25A7%25C3%25A3o+de+risco+cardiovascular+pdf
    • http://files.darrenwilson.net/uploads/1/3/1/4/131437149/tikazojezazeb_vomoru_sisego_xaxamifitepo.pdf
    • http://files.livingcanvasmedia.com/uploads/1/3/1/1/131164157/naduwob.pdf
    • http://files.uglybugaboo.com/uploads/1/3/0/9/130969061/wexenuzajovine.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/4570/0262/files/58451086674.pdf
    • https://cdn.shopify.com/s/files/1/0430/6580/2903/files/54452065386.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/makkar_ielts_speaking_cue_card_2020.pdf
    • https://cdn.shopify.com/s/files/1/0439/8376/5662/files/wuzumevupababelofoxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7673/8462/files/67745405024.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/fitisidusone.pdf
    • https://cdn.shopify.com/s/files/1/0449/5890/8584/files/lab_volt_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/multiple_alleles_blood_type.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/gasiratuxupadadogem.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9621/files/budismo_zen_libros_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20424522606.pdf
    • https://cdn.shopify.com/s/files/1/0429/1048/2591/files/examen_ceneval_simulador.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_off00006244.bin
25b4701222ac2610acb9bf487f3978967f8529854aed95c634d8637b0f858b4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6244 5440 bytes
font_01_sfnt_off000073fc.bin
525f597bd2843d5cc68e07d3a2b1d7a7703cd1ec84bf302e835c039183dd896a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FC 12968 bytes
font_02_sfnt_off000099ff.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99FF 4324 bytes

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