Malicious PDF — malware analysis report

Static analysis result for SHA-256 7638c539eb97ab97…

MALICIOUS

PDF

42.4 KB Created: 2020-08-07 03:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbdccb511a2505ca1566d2fd45f420d2 SHA-1: 1a60eefad144538896c6c1d9a7bea2b468f2ba2f SHA-256: 7638c539eb97ab97f4896fab7a0c1da14020d157fe900212a57065ac089b31fe
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO poisoning scheme to lure victims to malicious sites.

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=fisiocratas+y+mercantilistas+pdf
    • http://files.fiddleheadmarina.com/uploads/1/3/0/7/130776273/fifitixivojuvil-zokojo.pdf
    • http://files.velvetandtulle.com/uploads/1/3/1/1/131164350/zuwusebapuze.pdf
    • http://nixil.interlock.com.sg/uploads/1/3/0/7/130775971/5959feb561299.pdf
    • http://files.4therochesterraiders.org/uploads/1/3/1/0/131070124/1e4c6f50afb94.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2009/0517/files/lizopitus.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/yamaha_ttr_50.pdf
    • https://cdn.shopify.com/s/files/1/0430/7612/4821/files/hygienic_practices.pdf
    • https://cdn.shopify.com/s/files/1/0439/2153/9240/files/alfred_adler_biography.pdf
    • https://cdn.shopify.com/s/files/1/0429/0514/1411/files/9063077957.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/64339227580.pdf
    • https://cdn.shopify.com/s/files/1/0433/7516/5594/files/jozirevupifitikagajedef.pdf
    • https://cdn.shopify.com/s/files/1/0432/9157/4430/files/can_t_find_my_way_home_chords.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/bosch_3323_oil_filter.pdf
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/31829539951.pdf
    • https://cdn.shopify.com/s/files/1/0431/3851/5095/files/55665058557.pdf
    • https://cdn.shopify.com/s/files/1/0437/8725/5970/files/dimiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/vumogikajudewimawuzit.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_off0000695d.bin
06f10c3da755e41b5db3e68518b87f7c3efd4fc2ad427f2196ca5573297ec42e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695D 5360 bytes
font_01_sfnt_off00007b8f.bin
7e2fb21e71efbfad3de7b99d624d8377a7448e58b99d048d9b1faa694bb4f08c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8F 9628 bytes

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