Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a0a26f87514377…

MALICIOUS

PDF

56.6 KB Created: 2020-08-18 18:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e970db28899733340f0bdd9222d6c806 SHA-1: 3bef1075b0f9bcd440235b66d23c9024e0555299 SHA-256: 75a0a26f875143773e96c6c8c3f7f795fdf31466a547288056c9b917ac4d1e79
154 Risk Score

Malware Insights

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

This PDF document contains numerous links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phish users. The document body itself is largely obfuscated but contains the suspicious URL.

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=vivaldi+four+seasons+spring+sheet+music
    • http://files.communitymidwivesofbrantford.ca/uploads/1/3/2/6/132680870/zijewew_fofavi_baruj.pdf
    • http://jobuku.canaanchristianministries.co.uk/uploads/1/3/1/3/131379578/efa5d66cb4ca14b.pdf
    • http://nusipegam.boyscout507.org/uploads/1/3/1/3/131398097/d02f0559.pdf
    • http://likixuno.khloekares.com/uploads/1/3/1/0/131071243/3886719.pdf
    • http://files.judithgarvinbickel.com/uploads/1/3/0/7/130776712/513983.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0429/2516/2652/files/onenote_ipad_annotate.pdf
    • https://cdn.shopify.com/s/files/1/0446/3758/5571/files/balanza_de_pagos_estados_unidos.pdf
    • https://cdn.shopify.com/s/files/1/0441/0382/7608/files/37560228998.pdf
    • https://cdn.shopify.com/s/files/1/0433/0323/9835/files/sixazewiwaverox.pdf
    • https://cdn.shopify.com/s/files/1/0436/9874/9608/files/liboviradizovozadu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0941/6095/files/scala2_water_booster_pump_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70282461387.pdf
    • https://cdn.shopify.com/s/files/1/0434/3755/5868/files/zifotakomeguzozorabowij.pdf
    • https://cdn.shopify.com/s/files/1/0438/4191/2997/files/38171260050.pdf
    • https://cdn.shopify.com/s/files/1/0433/7611/5863/files/html_to_php_laravel.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/surapalobunimurifuzedusag.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2779/files/basanti_chumma_de_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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000add3.bin
144ee6d11298fdd4c0c94ff88ad82dc13e5183f64be87fd5b8b055f3f8549b90		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xADD3 21000 bytes
font_00_sfnt_off0000523c.bin
1e322b554c566163f032aab1cdbc6df9ced1688e5e9c278ea79ff57cb069dcff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x523C 3564 bytes
font_01_sfnt_off00005f28.bin
0953553528e7cef6f12c0ac27be7f190005cf5e48ea11bf957b565599bcda751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F28 5596 bytes
font_02_sfnt_off000071fb.bin
c1dd3aedbb11a038a5a8aefd699569f3d863a2494daea705be92540118d2dc58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71FB 7344 bytes
font_03_sfnt_off000085f0.bin
d43ef92515262bf51b381e26c6e53fc9a8a72b99e036cf470d167f9be4768ade		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85F0 11992 bytes

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