Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bac4dfc138435ff…

MALICIOUS

PDF

45.5 KB Created: 2020-08-19 03:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c56521ee7a551725f4693a44660442a SHA-1: 45455ee834c9f5fd1e70f4740b7e47e9e68bea8d SHA-256: 5bac4dfc138435ff41a84874864cbb655017182811f6fdd0d7d563b5230eacc5
154 Risk Score

Malware Insights

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

The PDF document contains embedded links that lead to a redirector service, which is a common tactic for distributing malware or phishing pages. The document body, though heavily obfuscated, contains text suggesting it is a 'proposal skripsi akuntansi biaya pdf', likely a lure to entice users to click the malicious link. The presence of numerous external PDF links further indicates a link farm, often used to obscure the true destination or to generate traffic.

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=proposal+skripsi+akuntansi+biaya+pdf
    • http://durel.sansburymedical.com/uploads/1/3/1/1/131164366/5818276.pdf
    • http://files.lbcmetz.com/uploads/1/3/1/8/131872298/aa97019af1abc1.pdf
    • http://files.luskccmaths.com/uploads/1/3/1/3/131379833/zikinitewatizoj_xitukok_xijuvitatu_joxut.pdf
    • http://files.greenwichinternationalpreschoolkinder.com/uploads/1/3/2/6/132695248/e711a.pdf
    • http://files.oldhamwayultra.co.uk/uploads/1/3/0/9/130969330/zidodozeleponet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/4295/4650/files/55425818239.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/pasidoxevogurebasusop.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/rogipubuzilorav.pdf
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/85010992514.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/72218710217.pdf
    • https://cdn.shopify.com/s/files/1/0432/2390/8520/files/lake_amador_fishing_report_november_2018.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8390/files/31864945401.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/dalikikakimotipobemoruja.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7907/files/riesgo_cardiovascular_framingham_2020_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0447/2812/3545/files/42093133952.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_off00006575.bin
b0761deeba70d62e6d56917059c2349b101dcb952ac42c6d7c91c03d75220fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6575 5108 bytes
font_01_sfnt_off000076d4.bin
fe2bb3b9d730aa684c718f97813a4c25922735323f783ece2b3bc775a5a6d161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D4 11348 bytes
font_02_sfnt_off00009b34.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B34 4324 bytes

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