Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ecd1dcce73024a4…

MALICIOUS

PDF

57.3 KB Created: 2020-08-14 19:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9bad997667725cd6f91a76e1fec7c37 SHA-1: dd4c8e3056b7e8b007d685e6ad4fa8b2f6b56510 SHA-256: 6ecd1dcce73024a42586d48b14701c832d9ff4475dc7256dc1abaf5712596bf8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to what appears to be a link farm, with one critical link redirecting to malicious infrastructure. The document body, though heavily obfuscated, contains text related to messaging apps and includes the primary malicious URL. This suggests a phishing or scam attempt designed to redirect users to potentially harmful 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.com/pify?keyword=best+messaging+app+for+ios+and+android
    • http://files.jackcnissen.org/uploads/1/3/1/1/131164152/wotuvizakir_gemolexesota_sabel.pdf
    • http://ranev.sarahleavittlpc.com/uploads/1/3/0/8/130874063/5548568.pdf
    • http://files.koreamonthly.com/uploads/1/3/2/8/132815123/234a24cc9b.pdf
    • http://files.bbbforlearning.com/uploads/1/3/0/7/130740073/zedexipebedazep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6504/1308/files/lenumanutimozipejifa.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6774/files/wavipuxazif.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4935/files/gozuretilawixaruvovuxajor.pdf
    • https://cdn.shopify.com/s/files/1/0439/4260/9051/files/83525073210.pdf
    • https://cdn.shopify.com/s/files/1/0434/6642/4470/files/oona_chaplin_game_of_thrones.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/todefuzuliwe.pdf
    • https://cdn.shopify.com/s/files/1/0440/4989/1478/files/mathematics_in_the_modern_world_topics_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/72444151917.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/bundesagentur_fr_arbeit_kln.pdf
    • https://cdn.shopify.com/s/files/1/0432/9707/9460/files/stream_music_from_windows_10_to_android.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_off0000a32b.bin
f077298a5244141bf2ed66374bb205406feb287964b69e850b1eeda0f0413e31
pdf-font-stream PDF embedded font (sfnt) at offset 0xA32B 5380 bytes
font_01_sfnt_off0000b558.bin
86510a4d384f65c14925c4fa8b3fba98ed87e3019b522ec7759bd2adc0b3af5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB558 10312 bytes