Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0f5a1471b25edc…

MALICIOUS

PDF

51.3 KB Created: 2020-08-08 20:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5604cde5057ef0685b2cd35463002654 SHA-1: 624f87e0244fb9fa2d150f113b6ca671564b2a25 SHA-256: 5f0f5a1471b25edce0acc2c63ed8ed0789132fc201207fe92f1f7f3eb2027256
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting a scheme to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, but the presence of malicious links indicates an attempt to lead the user to harmful content.

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=ecocardiograma+normal+pdf
    • http://files.gardenclubofyarmouth.org/uploads/1/3/1/4/131408942/7102347.pdf
    • http://zitanuf.buscolibrary.org/uploads/1/3/1/4/131453574/7871622.pdf
    • http://files.centralbluemountainsgardenclub.com.au/uploads/1/3/1/3/131381518/wujebufuwozut.pdf
    • http://files.divinenaturearts.com/uploads/1/3/1/3/131380767/9204954.pdf
    • http://files.vision-networking.ca/uploads/1/3/2/7/132740536/101257.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8180/8549/files/pipebanoduvik.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0679/files/32690280897.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mazimuzoxoku.pdf
    • https://cdn.shopify.com/s/files/1/0430/9634/2695/files/67556944818.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/41682101369.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/94677122942.pdf
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/aprender_a_empreender.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vinujavezo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0933/4683/files/carbon_oxygen_cycle.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7584/files/30860788218.pdf
    • https://cdn.shopify.com/s/files/1/0430/1098/2041/files/wojutit.pdf
    • https://cdn.shopify.com/s/files/1/0436/8809/9993/files/mikukoxubolafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3204/2920/files/rimakexiju.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3548/files/35485654591.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87967576867.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_off00007e3f.bin
9ab4a910011294551df35855faaa5933918fe1f9ea6fd644f2a4da1924391d10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3F 5252 bytes
font_01_sfnt_off00009010.bin
dc99f00044b0b1053e7941339b646470971ebf7de1a4855c0ff8e9bdb33d1c4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9010 16056 bytes

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