Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2013a8107a4f046…

MALICIOUS

PDF

47.4 KB Created: 2020-08-03 18:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8a20c1d8a84ac5dd5683dec8bf41c46 SHA-1: aca100285b0fcd9bae7bbda2941e1495ed4a1634 SHA-256: b2013a8107a4f04645d7c8322454efb3cab7b972c4e11a5001e81d914dd57138
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high density of external links, many of which point to a link farm designed to manipulate search engine results. One critical heuristic identified a link to a known malicious redirector infrastructure at https://ttraff.com/pify?keyword=teaching+reading+for+young+learners+pdf. This indicates the document's primary purpose is to redirect users to malicious content, likely for phishing or malware distribution.

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=teaching+reading+for+young+learners+pdf
    • http://files.independencebaptistchurchtx.com/uploads/1/3/0/7/130775135/ed339592aa0d0.pdf
    • http://files.azerperlite.com/uploads/1/3/1/3/131383743/12b900.pdf
    • http://xobibobo.vortexengineer.com/uploads/1/3/0/8/130874631/wekines.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/27810265679.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/51412520206.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/50852788937.pdf
    • https://cdn.shopify.com/s/files/1/0430/0773/8019/files/anthony_robbins_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/ranuxarisonazaruvale.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/levoketajimite.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41732402988.pdf
    • https://cdn.shopify.com/s/files/1/0435/6859/5112/files/vokomuxunoxepexoxifevat.pdf
    • https://cdn.shopify.com/s/files/1/0431/4300/4322/files/4229190248.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/86991503705.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1692/files/kanulofibijipurelikuso.pdf
    • https://cdn.shopify.com/s/files/1/0434/7078/2624/files/skaven_7th_edition_army_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/2663/5162/files/67357305608.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000792c.bin
ba87e537293491c34cdfe7edcbb760099ab5a04a969581ea8e5d2bba98103162
pdf-font-stream PDF embedded font (sfnt) at offset 0x792C 5468 bytes
font_01_sfnt_off00008bcc.bin
85e8a08f5a15c474a1673811eb271d2e3ea8f1cba26de109f4fd3676defa83a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCC 10620 bytes