Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1b125e384c413d…

MALICIOUS

PDF

45.6 KB Created: 2020-08-21 06:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddd1876a14cf40fb96ec39167a42a8c8 SHA-1: e2962aca4cb78de0c463b69ef890df8b4af5c315 SHA-256: 6c1b125e384c413d26558956549aa77ff076f941273c69a308cfde1d81786a82
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into clicking it. The presence of many external PDF links also indicates a potential SEO link farm tactic. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links.

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=diagrama+de+causa+e+efeito+pdf
    • http://metovijox.fenianfear.com/uploads/1/3/2/7/132740708/tinogotasebodofusij.pdf
    • http://files.ptccommunitygardens.org/uploads/1/3/0/7/130776861/9534671.pdf
    • http://tabibala.evolutiondance.ca/uploads/1/3/1/3/131398591/sewabivutinonar.pdf
    • http://files.rstuners.com/uploads/1/3/0/7/130775743/8322659.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2440/1063/files/semiconductor_devices_and_circuits_aloke_dutta_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6853/8521/files/mezavetopegixatej.pdf
    • https://cdn.shopify.com/s/files/1/0432/5385/8472/files/verigofut.pdf
    • https://cdn.shopify.com/s/files/1/0431/0168/3873/files/sadewobosur.pdf
    • https://cdn.shopify.com/s/files/1/0435/8550/3393/files/danafunewenowuzozudibadin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zumimulapowekulusevenire.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/judegesuzopo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4344/5141/files/moxetagejovidanabilivoluv.pdf
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/vepexasumexiragubakexoxos.pdf
    • https://cdn.shopify.com/s/files/1/0440/0722/7542/files/59327799830.pdf
    • https://cdn.shopify.com/s/files/1/0430/3483/7149/files/65377422412.pdf
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/65987259838.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_off00006fb8.bin
6248451d90f014918c224c21c2e5e4b24ed5bd5e7789a4291848fe8eadf4051d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB8 5440 bytes
font_01_sfnt_off00008220.bin
c1768640e08dfafeb206bfbda029f698de575d22d8fa653ce9f4367d28796bbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8220 12536 bytes

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