Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b7dbccf5d491a2…

MALICIOUS

PDF

42.7 KB Created: 2020-08-24 19:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d402fe0fd198a859fc19ab6a8fb98605 SHA-1: 3a30882749d0cc9e6aea0208d97e6c774945c252 SHA-256: 14b7dbccf5d491a2ae87f474738eff58aae49aef18ea40cc92b69fd12a5a47b8
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded link text suggest a lure related to 'Google play store app android'. The PDF also contains a large number of external links, characteristic of a link farm, with the primary redirector being a known malicious domain. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to drive users to malicious content.

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=google+play+store+app++android+2.+2
    • http://files.fpsch.com/uploads/1/3/2/7/132740275/gitemedera.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6109/2245/files/wunojopagekuwevametu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/mamemezugodazireseluj.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5183/files/vofuno.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/psychology_david_myers_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/13124142762.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7187/files/1129466646.pdf
    • https://cdn.shopify.com/s/files/1/0436/3082/1529/files/75266393740.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2559/files/28045108420.pdf
    • https://cdn.shopify.com/s/files/1/0431/0273/2448/files/nanerorepow.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_off00006862.bin
c876dacb7407d7e8125a29cb3e3c897a9f09dcb41e1ddb4ee4f228a875049ebb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6862 5424 bytes
font_01_sfnt_off00007af3.bin
ccee3c4ae1af28d3c81c9382639903d1a68f33f87e43d3a8f00a9604884967d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF3 10388 bytes