Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e0fb71d9df8ba0…

MALICIOUS

PDF

41.7 KB Created: 2020-08-22 04:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2678a48f45e546dc99f746f95cc2647 SHA-1: 5af74b700e46983bb2dc37787d9f2f4151aa3aaa SHA-256: 11e0fb71d9df8ba0b9922e4c8e57be2067b1df09d98d24c8b612d60ef5fb2799
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be a lure for educational materials, which then redirects to a malicious domain. This suggests an attempt to trick users into visiting a malicious site, likely for further exploitation or credential harvesting.

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.com/pify?keyword=first+grade+addition+worksheets+free+printable
    • http://files.inspirationaltalentmanagement.com/uploads/1/3/2/6/132681579/zodukikug_xonaziza_mabovunodu.pdf
    • http://bifubusok.tpccommunicationsaustin.com/uploads/1/3/0/7/130739892/ropag_peledem_bijaxaroxadowa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6449/1174/files/broadsheet_port_melbourne_breakfast.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4051/files/67055617597.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6123/files/company_profile_fashion.pdf
    • https://cdn.shopify.com/s/files/1/0450/6599/4392/files/kenmore_microwave_model_721_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9309/files/4_times_tables_worksheets_ks2.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/52577288204.pdf
    • https://cdn.shopify.com/s/files/1/0431/6663/0037/files/bawli_tared_hd_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/2986/4343/files/voromurajagedopeludezukux.pdf
    • https://cdn.shopify.com/s/files/1/0434/3136/2725/files/22713399317.pdf
    • https://cdn.shopify.com/s/files/1/0430/8038/4674/files/32960204276.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8919/files/14942942108.pdf
    • https://cdn.shopify.com/s/files/1/0427/4972/2790/files/valores_normales_biometria_hematica_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/65930602470.pdf
    • https://cdn.shopify.com/s/files/1/0438/0921/0529/files/can_android_music_from_itunes.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_off00005fb7.bin
b2a1a4a29b5471b2cdee7ba3035841508fb79e0418b611936aa0a4bf67a387ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB7 5556 bytes
font_01_sfnt_off0000729f.bin
1b6a824d6e40a4a2a7ed260bf94c9782fb81a3534ac05c98f885758a0b3904ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x729F 11604 bytes

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