Malicious PDF — malware analysis report

Static analysis result for SHA-256 578b019c3f40e589…

MALICIOUS

PDF

50.6 KB Created: 2020-08-07 09:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d525a3d19b3dcf95faef6391c10dfb76 SHA-1: 3d3e9b6c72e4c2c166a0d5d2a6fa12054ff9fba7 SHA-256: 578b019c3f40e5894951b1bd4cd0117deae757386739190363ba992a9c6ced3c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'simplifying algebraic equations pdf' and the malicious URL. The primary attack vector appears to be a lure to a malicious redirector, likely for further payload delivery or phishing.

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=simplifying+algebraic+equations+pdf
    • http://piwewi.keithdeininger.com/uploads/1/3/1/0/131070722/5367980.pdf
    • http://files.belarte-ardeco.com/uploads/1/3/1/8/131857580/8443082.pdf
    • http://files.carsonvalleycommunityfoodcloset.org/uploads/1/3/1/4/131408024/1172670.pdf
    • https://cdn.shopify.com/s/files/1/0434/7556/6752/files/ct_bill_of_sale.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0250/files/17106305323.pdf
    • https://cdn.shopify.com/s/files/1/0437/9770/8957/files/vavesa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6776/7970/files/77809157295.pdf
    • https://cdn.shopify.com/s/files/1/0438/1776/2973/files/cells_and_tissues_chapter_3.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/xumemesewugujaroruzuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/7755/8681/files/mufaforupokufuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8100/7255/files/jeraxagedoguxupefesosuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/48127068026.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6053/files/25503236852.pdf
    • https://cdn.shopify.com/s/files/1/0435/5329/2440/files/47764780332.pdf
    • https://cdn.shopify.com/s/files/1/0429/9993/9235/files/jobab.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/juwurigabux.pdf
    • https://cdn.shopify.com/s/files/1/0428/1391/5303/files/nonoloxabemarulogulenijol.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/
    • https://cdn.shopify.com/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065d9.bin
2c2220d9044d1ba1b9b820dbd6bb74067adf2d18e5b8e8e219a55d5ca23e896e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D9 5944 bytes
font_01_sfnt_off000079f7.bin
16544f1dd16d73cfe9270ac6e5d9cfb3bd5ef3a7826ca09a2ad1dd3b564dfff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79F7 14236 bytes
font_02_sfnt_off0000a813.bin
ae4c1039909c6b18400a693790947520403f0a9c3cdc5bdc37254682f4165006		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA813 16080 bytes

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