Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1f503dd4e824d4…

MALICIOUS

PDF

44.7 KB Created: 2020-07-11 13:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c76c9671410097e0ff2e8de37b3f1680 SHA-1: 57f957179b5db94ba549ea3bfcf0dc984992257e SHA-256: ae1f503dd4e824d4a34c1af639eb61fe5db6d54b98f41cfc0bd804b884c27d23
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, such as 'ttraff.com'. The document body, though partially garbled, contains text related to 'exercicios sobre blocos economicos', suggesting a lure to disguise the malicious intent. The primary goal appears to be directing users to potentially harmful external websites.

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=exercicios+sobre+blocos+economicos+com+gabarito+9+ano
    • http://files.jleatherwoodtrading.com/uploads/1/3/0/8/130874129/5fafacd2ecdc.pdf
    • http://files.maylingmartinez.com/uploads/1/3/0/7/130739072/78b41.pdf
    • http://files.markhendrickstribute.com/uploads/1/3/0/7/130775603/5877166.pdf
    • http://files.opportunityknits.com/uploads/1/3/1/4/131408203/kumibed.pdf
    • http://files.jackblairgray.com/uploads/1/3/1/3/131384018/eede518175.pdf
    • http://files.burkittsvilleruritanclub.org/uploads/1/3/2/8/132815008/vanixidewimeguw.pdf
    • http://files.midvalleyschooloftheology.com/uploads/1/3/2/6/132683173/a5d62aafc1.pdf
    • http://files.blackdalhiaarts.com/uploads/1/3/1/0/131070751/xudobekudutukiludaxa.pdf
    • http://files.flyfishingcoyhaique.com/uploads/1/3/1/4/131454304/7539451.pdf
    • http://files.yurileving.com/uploads/1/3/1/4/131409127/9621348.pdf
    • http://files.kitosbiotech.org/uploads/1/3/0/7/130738830/jorudowupem.pdf
    • https://mikumopilax.files.wordpress.com/2020/07/wugijimefufonesavikowu.pdf
    • https://xumeloroze.files.wordpress.com/2020/06/bekimuxizubelubi.pdf
    • https://fiwukezebara.files.wordpress.com/2020/06/22097033424.pdf
    • https://debemid.files.wordpress.com/2020/07/muluwuliworib.pdf
    • https://sunokowezepe.files.wordpress.com/2020/06/18096660387.pdf
    • https://butivekon.files.wordpress.com/2020/07/4260153743.pdf
    • https://rotirolaj.files.wordpress.com/2020/06/88668727236.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/14847982439.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75320426607.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/45620088026.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/19892542520.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bojakotipizijogi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xigorekotat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pazutorigixasozesilax.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_off00006c33.bin
c3101769883dee1932ce22a2b3252866a4c445c37a781c9a28cfa386d0f4397f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C33 5228 bytes
font_01_sfnt_off00007dd9.bin
c9d22dcadb8cede69d25d72347ef001f14b5f05ba74abc6403f605a89fb34f4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD9 12416 bytes

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