Malicious PDF — malware analysis report

Static analysis result for SHA-256 19059692c07fbd81…

MALICIOUS

PDF

38.9 KB Created: 2020-08-22 00:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a3b84c0f31d94730f184fdb70393cac SHA-1: ec2091a080bc2ae1acc7443048d3d82c94a5fc92 SHA-256: 19059692c07fbd81217b8710332be3b2a6af486e8e1a0e0c703f58c94bce493d
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially obfuscated, contains text related to an 'Ofsted report' and a URL that appears to be part of a link farm designed to manipulate search engine results. The ML classifier also strongly flagged this PDF as malicious.

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=linden+primary+school+ofsted+report
    • http://xefuj.pricefloral.net/uploads/1/3/1/8/131857315/sesimugadek-tomubolekafen-walixujud-bubizadetam.pdf
    • http://rasobupas.nolasome.com/uploads/1/3/1/3/131383042/733032d6.pdf
    • http://files.brazossunrisefarms.com/uploads/1/3/2/6/132681685/diwodugedegumu_lilug_jumojofe_sagem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/7260/0729/files/xitagusaledikekowisipag.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1438/files/bisujibixubolowibuwisabe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/how_to_get_emotes_on_twitch.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/92187310863.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gigogew.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/85058981260.pdf
    • https://cdn.shopify.com/s/files/1/0443/6059/7660/files/najuvewarewuzemuvaraxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1062/files/boletin_judicial_estado_de_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2626/files/synonyms_and_antonyms_worksheets_grade_8.pdf
    • https://cdn.shopify.com/s/files/1/0435/1141/4939/files/chrome_77_mac.pdf
    • https://cdn.shopify.com/s/files/1/0436/9642/3080/files/affidavit_of_loss_sss_id_template.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_off00005881.bin
459284150d0357d52a9f118f9164557beac20972937e286f55933ec20b647e1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5881 5436 bytes
font_01_sfnt_off00006ad2.bin
793726420e8a2bd3ad631546a70e8d4a4272c40e891750a42f12fcd9bb706b65
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD2 10552 bytes