Malicious PDF — malware analysis report

Static analysis result for SHA-256 6920fbdded8cb70e…

MALICIOUS

PDF

37.7 KB Created: 2020-08-13 04:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9b5856a342a01ee3b303e8dab8bcf0b SHA-1: 06a3a6c85ab96ef4a76b9bf9c66f30f627302ae1 SHA-256: 6920fbdded8cb70e041a1b19d1fae992ff5c07adb7135ec5c8f538d8c363cafe
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a known malicious redirector, disguised as a handwriting worksheet creator. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate the presence of malicious infrastructure and a link farm, respectively. The ML classifier also strongly flagged this PDF as malicious. 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.cc/wb?keyword=d
    • http://binavir.sciencemra.com/uploads/1/3/0/9/130969536/9843829e0.pdf
    • http://files.kidsaroundaustin.com/uploads/1/3/2/7/132740880/kupoxorafewizi.pdf
    • http://files.onspotexam.com/uploads/1/3/0/9/130969371/dazif.pdf
    • http://fiwibeti.thehanssonlab.com/uploads/1/3/1/4/131410227/1fe0a801af73a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5680/8607/files/67746710349.pdf
    • https://cdn.shopify.com/s/files/1/0429/5563/6889/files/i_dreamed_a_dream_partitura_piano.pdf
    • https://cdn.shopify.com/s/files/1/0432/5054/8899/files/attention_span_test.pdf
    • https://cdn.shopify.com/s/files/1/0429/0953/2316/files/81799077248.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/juvinepojoxij.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/90897254815.pdf
    • https://cdn.shopify.com/s/files/1/0452/0319/4007/files/bescherelle_arabe_francais.pdf
    • https://cdn.shopify.com/s/files/1/0430/1262/0447/files/15266365717.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/durisazekuzuzoviwit.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8789/files/dictionary_arabic_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/3391/0681/files/google_maps_set_zoom.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/waviguresusodarufuwejov.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_off00005423.bin
8ceb094eb805f9959792f8582de987aa352f8e396ac8bde5c852b513bb427f1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5423 5388 bytes
font_01_sfnt_off00006685.bin
ca0b324b161c6821864b7778c002d7dd97bc9036f895e348a8c2335c95e6ab34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6685 10196 bytes

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