Malicious PDF — malware analysis report

Static analysis result for SHA-256 3999e049878110da…

MALICIOUS

PDF

48.6 KB Created: 2020-09-03 19:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcfece6266ad114d097302d0cf1933de SHA-1: 7b342b92cee8bfb089227f0b63f5d136ae5feff0 SHA-256: 3999e049878110da1ddd912acd871e9bc2f68154f5fa98b0a12171489ae2d524
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to lure users to a malicious site. The document body, though heavily obfuscated, contains references to the redirector URL and numerous other PDF links, suggesting a link farm or redirection strategy.

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=dipper%2527+s+guide+to+the+unexplained+supercut
    • https://cdn.shopify.com/s/files/1/0429/9273/0275/files/momotunegivorid.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/66882940141.pdf
    • https://cdn.shopify.com/s/files/1/0428/5012/3943/files/bumesez.pdf
    • https://static.usrfiles.com/ugd/89441e_7d4f0227f6ac429b8cf246101df3004b.pdf
    • https://static.usrfiles.com/ugd/5b9365_f83f9fee7fc746af90f630ee067beb1b.pdf
    • https://static.usrfiles.com/ugd/440e29_009a3ec09bfc40288424a0683b9271e4.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_33a0459c744b4a608b424a2a357926e1.pdf
    • https://cdn.shopify.com/s/files/1/0435/4647/6708/files/konokefe.pdf
    • https://cdn.shopify.com/s/files/1/0430/1688/0281/files/kuwor.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/80438534520.pdf
    • https://cdn.shopify.com/s/files/1/0433/7988/4199/files/62442080074.pdf
    • https://cdn.shopify.com/s/files/1/0433/7251/1386/files/tugel.pdf
    • https://cdn.shopify.com/s/files/1/0436/2128/6050/files/39014020628.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2950/files/niwik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070e7.bin
0bcc45d656ee7f8dc75406d598fa0f6f669b98c919239e280d24bc4991777853
pdf-font-stream PDF embedded font (sfnt) at offset 0x70E7 5320 bytes
font_01_sfnt_off000082ff.bin
2fbb386a49de054a1968df4bfbb0e4990874e5e36fffcde0c13317ea789a7e55
pdf-font-stream PDF embedded font (sfnt) at offset 0x82FF 11124 bytes
font_02_sfnt_off0000a786.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xA786 4324 bytes