Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d39781f15d5be4…

MALICIOUS

PDF

43.7 KB Created: 2020-08-13 15:39:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc46a450b14ce1dc669deb01816f3d11 SHA-1: 9759e7ca9c9f6470d3f61bf18206fe3fe6e75f10 SHA-256: 91d39781f15d5be41670509fcdce479d6ad9a31f10d60a3c10f4001fe16a89e3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and references to the embedded URLs, suggesting an attempt to lure users to malicious content. No scripts were extracted from this sample.

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=hebdomada+aenigmatum+pdf
    • http://files.shuckinfun.com/uploads/1/3/2/8/132814387/wawipib_mugonatezebekax_vidanebaz_tagasawasifeji.pdf
    • http://pejirumix.elkgroveketocorner.com/uploads/1/3/1/8/131856543/sutekojefe.pdf
    • http://files.englishtheatrecompany32.fr/uploads/1/3/0/7/130739802/nofogasemomupe_jemeluxetav_fuvuko.pdf
    • https://cdn.shopify.com/s/files/1/0440/2744/5413/files/gogunawusenof.pdf
    • https://cdn.shopify.com/s/files/1/0429/1385/7692/files/sagotinilupe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3664/7317/files/98771319427.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/70144406983.pdf
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/female_foeticide_and_infanticide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4016/files/66589843539.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1569/files/63922947299.pdf
    • https://cdn.shopify.com/s/files/1/0448/3943/6449/files/85542787960.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/vixizipola.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6822/files/27036649258.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6439/files/29494062819.pdf
    • https://cdn.shopify.com/s/files/1/0430/0800/0163/files/11607162825.pdf
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/46496927258.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006770.bin
f8771068c3e3a422c044230a493ad39670966157a71bc9740a3441f265093e66
pdf-font-stream PDF embedded font (sfnt) at offset 0x6770 5156 bytes
font_01_sfnt_off000078e9.bin
fab9950a69c68e17ed12e4aee121f2891edced2d8c567dcbdfc4bcb28a8372ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x78E9 12552 bytes