Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b34f1975a095fc…

MALICIOUS

PDF

47.1 KB Created: 2020-07-22 08:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50ece31966274887f478b8448a627a5a SHA-1: 4f8eb5e35de7f2c6c71206e9779e00b7c44dc2ff SHA-256: 65b34f1975a095fcd16b3bc34eb0df51ff16137fa4b337f7e48cfd91acacf35c
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 ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to 'general chemistry notes pdf', likely intended to trick users into clicking the malicious link.

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=a+level+general+chemistry+notes+pdf
    • http://files.rhiannonpower.com/uploads/1/3/0/7/130740513/424c8bd4.pdf
    • http://files.4therochesterraiders.org/uploads/1/3/2/6/132695301/pufolik_dugesiwexinexip_midewamitexaj.pdf
    • http://files.whitegallowaysofwayby.com/uploads/1/3/0/8/130873907/fewubogukobavel-sixomolimu-mifip.pdf
    • http://files.fullcrescentpress.com/uploads/1/3/0/7/130775215/683885.pdf
    • http://files.rosewesche.com/uploads/1/3/1/4/131406663/7aeaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5960/0798/files/96320199136.pdf
    • https://cdn.shopify.com/s/files/1/0431/1656/0550/files/xobujumelagibi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/39563281589.pdf
    • https://cdn.shopify.com/s/files/1/0428/6644/2406/files/gazemizufufewefis.pdf
    • https://wozimupo.files.wordpress.com/2020/06/78716192077.pdf
    • https://zoxapogu.files.wordpress.com/2020/06/4506534335.pdf
    • https://lubaxop.files.wordpress.com/2020/06/gemivotifuwifilesu.pdf
    • https://vusewotenat.files.wordpress.com/2020/07/29116384401.pdf
    • https://cdn.shopify.com/s/files/1/0433/4531/3941/files/kibusizevo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8225/1421/files/zekudimizo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nitupalakisotubawu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wuvinotagug.pdf
    • https://cdn.shopify.com/s/files/1/0433/1533/1227/files/zevapegutuxadujilig.pdf
    • https://cdn.shopify.com/s/files/1/0432/2538/3073/files/777850194.pdf
    • https://cdn.shopify.com/s/files/1/0428/7840/2723/files/69218459130.pdf
    • https://cdn.shopify.com/s/files/1/0434/7281/4245/files/89956199576.pdf
    • https://cdn.shopify.com/s/files/1/0434/2625/0917/files/woluwarewixumiko.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_off000078b6.bin
1c11bf8c71b14b2885ef2ea821299f1b1283219ef5cd0c6260ed2b6d3eb0d075		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B6 5508 bytes
font_01_sfnt_off00008b4d.bin
4bd6d8581d653396c34cb3cd6072a15abe31fc8e53e3837afaa25ed0136507e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4D 10376 bytes

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