Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc11264b8cf9997…

MALICIOUS

PDF

42.4 KB Created: 2020-08-12 12:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a28ee04797ea5835ea3a38a27a4f453 SHA-1: 2a74bb005299c8da5ccda5e43f956371b6597fec SHA-256: 8fc11264b8cf999770dbd38b950023e82ef32d41722ebd11dc85ed7b789420e3
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are disguised as academic content to lure users. One of the embedded URLs, https://ttraff.cc/pify?keyword=integration+formulas+of+inverse+trigonometric+functions+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent. The ML classifier strongly supports the malicious verdict.

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=integration+formulas+of+inverse+trigonometric+functions+pdf
    • http://nubem.bluestonegrill.net/uploads/1/3/0/7/130776078/fevuxusasojok_bafuzisi_wajamog_nolili.pdf
    • http://files.stmaryscountygardenclub.com/uploads/1/3/2/7/132740234/a32bd6fb759.pdf
    • http://files.hayeducationgroup.com/uploads/1/3/1/3/131384429/rovuvanedofafenuf.pdf
    • http://files.edmanphoto.com/uploads/1/3/2/6/132681153/9594284f54d51a2.pdf
    • http://sitizet.premierbreederwebsites.com/uploads/1/3/0/7/130775195/4808654.pdf
    • https://cdn.shopify.com/s/files/1/0432/5860/9817/files/gudenemo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/redukenedobitaguwowok.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6589/files/career_paths_electronics_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2386/7805/files/jukukijokagunizig.pdf
    • https://cdn.shopify.com/s/files/1/0434/6678/4932/files/absa_learnership_application_forms_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/6193/5261/files/millermatic_211_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/2215/4908/files/70339026570.pdf
    • https://cdn.shopify.com/s/files/1/0430/6249/3345/files/esl_agreeing_and_disagreeing_expressions.pdf
    • https://cdn.shopify.com/s/files/1/0436/8039/9513/files/jodibetokokuvasidu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/tapawopawexiluxaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2760/3354/files/burda_shareef_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0449/9360/9896/files/hemorrhagic_gastroenteritis_in_dogs.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ec9.bin
d5ef57cd7b29e4baeb4aa62fbdadc936f2a43b40715064e2b0f79e726e845609		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC9 5472 bytes
font_01_sfnt_off00007153.bin
f0a56f8d79fed954dcb14590daa4d5977789e426689734a4210a3b39c392aed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7153 13372 bytes

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