Malicious PDF — malware analysis report

Static analysis result for SHA-256 98054a8d6be821ad…

MALICIOUS

PDF

55.1 KB Created: 2020-08-01 23:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18b69391d77e5f1c91523a266eb07794 SHA-1: 3d49f355c80e7bcf603bdbd35c3c310e935bed1e SHA-256: 98054a8d6be821adaea15e92717720a3b51f8b6c29d1055e4b25553d9ccc9699
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link to a known malicious redirector. The document body itself is largely obfuscated but contains the redirector URL. The presence of a large link farm suggests an attempt to leverage SEO or distribute malicious content through numerous indirect paths. No scripts were extracted, limiting the analysis of direct payload execution.

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=length+of+a+string+c
    • http://files.belmonthighlibrary.org/uploads/1/3/1/4/131483488/namukiwirojuwuv.pdf
    • http://files.holisticwellnessconsultant.com/uploads/1/3/0/7/130740530/8431291.pdf
    • http://files.merinikula.com/uploads/1/3/1/8/131856556/c16fe5c2e8b.pdf
    • http://files.jordydeleon.com/uploads/1/3/0/9/130969862/govatabokaxiruk_nozut_zedakofan_ranotogusi.pdf
    • http://files.mr-stevens.com/uploads/1/3/0/7/130776864/zoxakaso.pdf
    • https://cdn.shopify.com/s/files/1/0438/3080/4637/files/nidukefotap.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/zofirazo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8289/0912/files/microsoft_streets_and_trips_2013.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/70511588925.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/87445220384.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/batadofotawivavaf.pdf
    • https://cdn.shopify.com/s/files/1/0436/3150/9664/files/65807382405.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/80255676182.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/90427305906.pdf
    • https://cdn.shopify.com/s/files/1/0438/1078/3394/files/62495944018.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/90157998400.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/48038876302.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6665/files/78366868566.pdf
    • https://cdn.shopify.com/s/files/1/0439/0515/5240/files/42124177119.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006565.bin
72d13a609a22699cf2becf89cf8d3409d0d78d5ab075a663951321252df45abb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6565 7284 bytes
font_01_sfnt_off00007dff.bin
a4526a67fe91c74a69dbfbcb6c4d6431df248fe43227996c785d372c029ae5b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFF 5052 bytes
font_02_sfnt_off00008f35.bin
640e05d98e74fbba5e612ae557e538d52ede55d4fa7628a88eafecadeb736ffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F35 13320 bytes
font_03_sfnt_off0000ba37.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA37 16036 bytes

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