Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1b5f18a04bedb8…

MALICIOUS

PDF

41.3 KB Created: 2020-08-24 23:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3905ff1414f55f72fe8ca4feb32b13ee SHA-1: 99d8f60e8520619c5b2cb4a5cf58bf14f113e21d SHA-256: 9d1b5f18a04bedb85ba5861de1a8872f49170079eb36614c3011be5162e0e850
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 malicious redirector links and a large number of external links, indicating a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that appears to be the primary lure, leading to a redirector. 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=weather+report+jabalpur+patan
    • http://files.sumayyaco.com/uploads/1/3/0/7/130739782/xunizakepi-mevinununite.pdf
    • http://sowexu.umpquavalleydrumlessons.com/uploads/1/3/2/7/132712615/puvotulusamila_vutijel_dolonibubise.pdf
    • https://cdn.shopify.com/s/files/1/0435/6099/2927/files/wow_classic_gnome_engineering_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/rejemivonuwawirimenuduli.pdf
    • https://cdn.shopify.com/s/files/1/0429/3738/5123/files/21615050533.pdf
    • https://cdn.shopify.com/s/files/1/0430/0269/1743/files/nilareb.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1718/files/87362327693.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2019/files/soal_akuntansi_perusahaan_dagang_dan_penyelesaiannya.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/41627020015.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/baba_black_sheep_nursery_rhymes.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/71721538247.pdf
    • https://cdn.shopify.com/s/files/1/0431/8288/2980/files/fejorexerolifuw.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/39532431305.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/encounter_shankar_movie_song_free.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_off00005b58.bin
bd8369c95c94f8f5149eabe614c7d310befda1ad53877f1f5d1ff62aac707e7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B58 4956 bytes
font_01_sfnt_off00006c3e.bin
37ef160bdc0aec2c22fdf481948432eb1174bb29a604737357fba08e5c6cc5a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3E 13456 bytes