Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6fe3ac5d9234a7…

MALICIOUS

PDF

37.5 KB Created: 2020-08-07 12:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5c072520da7d5231923544a6d6c30b4 SHA-1: 0987df521c194b28d88090a5fca628768c0e4b49 SHA-256: 8c6fe3ac5d9234a743f3c796f16dae21627c491d13d2060933a46883f572925e
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding a large number of external URLs. One of these URLs, 'https://ttraff.com/pify?keyword=btec+level+2+applied+science+book+pdf', is identified as a malicious redirector. The presence of numerous links, including one to a known malicious redirector, strongly suggests an attempt to lure users to malicious sites. The ML classifier also flagged this PDF with high confidence.

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=btec+level+2+applied+science+book+pdf
    • http://files.sweetiescateringnc.com/uploads/1/3/2/7/132710624/gedilavigitakebijara.pdf
    • http://files.nuimagedesigns.com/uploads/1/3/0/7/130775446/4538743.pdf
    • http://files.ulubeachhouse.com/uploads/1/3/1/0/131069934/6857507.pdf
    • http://files.sangeeskitchen.myworldrules.com/uploads/1/3/2/6/132695575/sawisuzada-lopipu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/saxudopafajaxeluzixikifu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1641/3607/files/77817061428.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/actron_pocketscan_plus_cp9410_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/convert_file_to_editable_word_document_for_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/31064482185.pdf
    • https://cdn.shopify.com/s/files/1/0431/2452/3169/files/tulizigipoxabowemis.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/46303675240.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/proveit_excel_test_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0790/0835/files/mofuwud.pdf
    • https://cdn.shopify.com/s/files/1/0435/6141/8913/files/82421828693.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/51924608045.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0021/files/20538159947.pdf
    • https://cdn.shopify.com/s/files/1/0437/7129/7943/files/16770947244.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2919/files/11878762307.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_off00005512.bin
871d1174fc20e8914b9baf420625ddf1975e90ab89350d3f4b860eefc512d528		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5512 5496 bytes
font_01_sfnt_off000067e2.bin
7d16be3ee0ed014792b221b28a6ef44940d08d40cb7e70ff038f4f196556df9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E2 9724 bytes

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