Malicious PDF — malware analysis report

Static analysis result for SHA-256 722e208123edc3d6…

MALICIOUS

PDF

52.7 KB Created: 2020-08-03 02:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3b3f5c5b31f64b1e0dbbd75f8d477ec SHA-1: b9cc0924c26077ef85b239940ebc547c6587c51c SHA-256: 722e208123edc3d6a34fe7fc03370b2171f76a8a588dfca4d573dba0dc4dd730
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The embedded URL points to a known malicious redirector, which likely serves as a lure for users seeking a 'sldprt to pdf converter'. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of malicious links and the overall structure suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/wb?keyword=sldprt%20to%20pdf%20converter%20free%20online
    • http://files.lifeclickscoaching.com/uploads/1/3/1/4/131453111/nolesegapoz.pdf
    • http://files.blueridgeestatewinery.com/uploads/1/3/2/7/132710697/bedalakenokigif_katigifi_duzoso_bomozowomase.pdf
    • http://files.meadowlynnfarms.com/uploads/1/3/1/3/131379268/9171176.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/ridoferupununinetak.pdf
    • https://cdn.shopify.com/s/files/1/0438/1478/1085/files/37790814049.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/asa_flight_planner.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/4898595913.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/cummins_nt855_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8646/files/duzug.pdf
    • https://cdn.shopify.com/s/files/1/0431/4464/2715/files/wemuta.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5792/files/tmux_split_horizontal.pdf
    • https://cdn.shopify.com/s/files/1/0428/5693/9676/files/2194671596.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0947/files/rituvijamoturupenojenaxiz.pdf
    • https://cdn.shopify.com/s/files/1/0439/6072/9758/files/da_form_1059.pdf
    • https://cdn.shopify.com/s/files/1/0430/5528/4378/files/71975853108.pdf
    • https://cdn.shopify.com/s/files/1/0433/2657/0664/files/30_pt_buck_song.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00007219.bin
f077ab0735494be4f4094c88be957528fc4863be1741a8a869c511502d816c26		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7219 12000 bytes
font_00_sfnt_off00006144.bin
cd6e12af2fe37ef4b1b43ae381f6f5fe08ced833c5447993c339bc73628f26fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6144 4924 bytes
font_02_sfnt_off000093ce.bin
52752db1e8c7bd0b307b5b99d25d5898dd784f47e8c79b4f0a07d3ca3948c1df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93CE 15880 bytes

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