Malicious PDF — malware analysis report

Static analysis result for SHA-256 723210e1e555395e…

MALICIOUS

PDF

45.2 KB Created: 2020-08-06 02:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34a43c282d3e3b4f46eb3ebbf40f9903 SHA-1: 0f15591beb81408e36c2fa4248c238394bf42bba SHA-256: 723210e1e555395e04a6f8d4605bb3bcf429c493b16ead7208e172facb48dddd
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body itself is heavily obfuscated, but the presence of the malicious redirector URL and the sheer volume of links suggest an attempt to drive traffic to potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these 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.ru/pify?keyword=ontology+in+computer+science+pdf
    • http://files.makariosinternational.org/uploads/1/3/2/6/132695663/lekegujapomozuve.pdf
    • http://files.kellytruax.com/uploads/1/3/1/6/131607712/pexawuxebare.pdf
    • http://files.aliciabanta.com/uploads/1/3/0/9/130969343/sosotekotim-zojefabalezi-sazozewiz.pdf
    • http://files.theshootinghand.com/uploads/1/3/1/4/131407057/59eeadb08e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/0941/6095/files/merge_linux.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdf
    • https://cdn.shopify.com/s/files/1/0428/2197/6220/files/bemanoribonorekaxovubu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87967576867.pdf
    • https://cdn.shopify.com/s/files/1/0432/9340/9438/files/37061154440.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4456/files/limitafadururefikabe.pdf
    • https://cdn.shopify.com/s/files/1/0438/2290/7554/files/getavepufuwiboguxipodof.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/tuperuwapejusoruz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0961/3725/files/88351049554.pdf
    • https://cdn.shopify.com/s/files/1/0432/0883/5234/files/kosuripifoxanigoxebut.pdf
    • https://cdn.shopify.com/s/files/1/0432/1463/5165/files/xafelujovisaxepa.pdf
    • https://cdn.shopify.com/s/files/1/0439/0620/3803/files/bauchi_state_university_admission_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/2947/9076/files/41359755839.pdf
    • https://cdn.shopify.com/s/files/1/0434/1845/2120/files/76042672230.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065b3.bin
1df3c4cd032709a152476cddccc25b947880ef52c6ffa87eed3bb8954a3b2047		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B3 5276 bytes
font_01_sfnt_off0000779b.bin
0840283cd021b167f790e858397d0070d7256bcdc7e3584184675e82cf1394e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779B 9988 bytes
font_02_sfnt_off000099cd.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99CD 4324 bytes

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