Malicious PDF — malware analysis report

Static analysis result for SHA-256 17556b08be4be039…

MALICIOUS

PDF

45.1 KB Created: 2020-09-06 15:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b50b4d6ce33fb159cfc7cd2d3d82df4 SHA-1: de8f2e584d8273f8e015487d154356a340731c17 SHA-256: 17556b08be4be0398afdefa834d20917638c463f2d28ce2ca199eefa8c6cbb94
154 Risk Score

Malware Insights

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

The PDF document contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a 'daily calendar planner template 2019', likely a lure. The presence of numerous external links, many pointing to benign PDFs, suggests a link farm or SEO poisoning attempt to mask the malicious redirector.

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.me/wix?keyword=daily+calendar+planner+template+2019
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/bcd086_951a96cda5684c158023531712c8ce60.pdf
    • https://static.usrfiles.com/ugd/b8c837_bebec2d79e4a49c6bd4768229736433d.pdf
    • https://static.usrfiles.com/ugd/45e30f_71d1f74cd32d4fc3920592b86b8f8fdb.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe7949643807437c89404e23c6aef9fe.pdf
    • https://static.usrfiles.com/ugd/9421c8_6749de4dc671497597ed5b3c6a8901a2.pdf
    • https://static.usrfiles.com/ugd/e2f197_8d1bf0d5044d424eb2250f9d2b0ee7fd.pdf
    • https://static.usrfiles.com/ugd/d902bb_dfb7a2f5fe6f4f7a8e5356746ab1385d.pdf
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/4046381243.pdf
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/wusudomafaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5360/files/remagegefomaxisowijini.pdf
    • https://cdn.shopify.com/s/files/1/0462/5996/2007/files/bathukamma_songs_naa_songs_v6.pdf
    • https://cdn.shopify.com/s/files/1/0433/8722/4213/files/free_online_promissory_note_form.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_off0000719c.bin
1630cd7cf4ffbc3f71c24a435e2c1cbf90db608a536fe4a2ccba3fa7bef57f58
pdf-font-stream PDF embedded font (sfnt) at offset 0x719C 5624 bytes
font_01_sfnt_off000084bf.bin
f4d3f1e9e3d16153f10cd27235617e54c7079eed9d91b686100c9010a6dca42a
pdf-font-stream PDF embedded font (sfnt) at offset 0x84BF 10316 bytes