Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b2dc3017cace4c…

MALICIOUS

PDF

41.8 KB Created: 2020-08-05 16:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4d2003a13087162540de839f4408a56 SHA-1: 0983f9107078c6e818a1c03f1a4668229bb2eafd SHA-256: 10b2dc3017cace4c1354436e8f365e245fc9a57eeea10e69e8c55bb5cc12083c
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'image to pdf converter' and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=image%20to%20pdf%20converter%20download%20for%20windows%2010
    • http://files.tomhumeartist.com/uploads/1/3/1/4/131453241/mujunatizovixikuxe.pdf
    • http://files.dashandrizzle.com/uploads/1/3/0/7/130739146/d41bd7a327.pdf
    • http://files.dallaswelldrilling.com/uploads/1/3/2/6/132696210/9506746.pdf
    • http://files.hkcofc.com/uploads/1/3/2/6/132683111/lobojevaresale_jojolurirukekof_nunaduwarutare_rulilik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3214/9148/files/2243296950.pdf
    • https://cdn.shopify.com/s/files/1/0437/4442/8181/files/romegajipeturewurabip.pdf
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/42091324261.pdf
    • https://cdn.shopify.com/s/files/1/0428/7424/1183/files/30593254037.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pobilimej.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5372/files/faboxepelopu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8660/0609/files/mabakekafexawulid.pdf
    • https://cdn.shopify.com/s/files/1/0431/0361/7173/files/malformation_anorectal_nouveau_n.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/cara_membuat_cv_menggunakan.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/tezibemutole.pdf
    • https://cdn.shopify.com/s/files/1/0434/1740/3559/files/worikag.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_off00006260.bin
a18b66ee7b5bb0e830bc3df3577709685186863825af29378e13dd676e0b4d04
pdf-font-stream PDF embedded font (sfnt) at offset 0x6260 5760 bytes
font_01_sfnt_off00007600.bin
c7a1395bf1eafc1b1b375d2c5cc8b602c49c271a605a3934ffffb54ce28fac3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7600 10520 bytes