Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7c623895cfd7f0…

MALICIOUS

PDF

42.2 KB Created: 2020-08-01 22:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc4fb8a7c74158cb2577c3df21a53155 SHA-1: afee664f642a3f16d343209ffaeb69cfa20b57bd SHA-256: 8a7c623895cfd7f09e0af42045939e947cba27ec0bf1f19a080f95bb5ed99adf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains numerous external links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=python+check+if+character+is+number'. Another critical heuristic indicates the PDF is part of a link farm, with 16 external PDF links, many hosted on cdn.shopify.com. The document body contains garbled text but also includes the aforementioned malicious URL and several benign-looking Shopify URLs.

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=python+check+if+character+is+number
    • http://files.emileegracephoto.com/uploads/1/3/1/8/131871894/7e5ba31aad6177a.pdf
    • http://files.jehphotography.net/uploads/1/3/2/8/132814906/8024579.pdf
    • http://files.therootofallpeace.com/uploads/1/3/0/7/130776499/vufojakujisitom.pdf
    • http://files.kushifarm.com/uploads/1/3/1/0/131070452/likifanorewi-felowuker-xijenubanobat.pdf
    • http://files.parkcityea.org/uploads/1/3/0/8/130874110/nurovarogokiwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5738/files/29260121498.pdf
    • https://cdn.shopify.com/s/files/1/0431/8792/9245/files/fighter_factory_mugen.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/95139020108.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1554/files/zafawenuxemod.pdf
    • https://cdn.shopify.com/s/files/1/0434/0894/9402/files/30427268486.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3925/files/62415916346.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7674/files/tawiwirejekezapakuxara.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1110/files/jirowigireravuberodufab.pdf
    • https://cdn.shopify.com/s/files/1/0439/9611/9198/files/ledupetivipe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sazofafusogowo.pdf
    • https://cdn.shopify.com/s/files/1/0439/4532/8808/files/wisokapija.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_off000060f5.bin
2078cbe3be8b2119610043137a807e5b0d69d1c89e90b3370e4680f1af5d8522		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F5 5396 bytes
font_01_sfnt_off00007337.bin
994f242929e90295b2db9524fd40a14c5d0f819ace3a1db940b7db918ad59544		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7337 12588 bytes

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