Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c55b5c52998937…

MALICIOUS

PDF

53.3 KB Created: 2020-08-11 20:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ee579b1e535ad6fec0e2fe119f19e71 SHA-1: bb6b4d966e9114c0bbf162411d3531e0922fd2ac SHA-256: 88c55b5c529989370f1f63dbfb55c1b3cefe54ed394607c05169adf470ce63a8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector, which is a common tactic for distributing malicious content or engaging in SEO link farming. The ML classifier strongly indicates maliciousness. The presence of numerous external PDF links suggests an attempt to manipulate search engine rankings or distribute a large volume of content, potentially malicious.

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=algorithmen+und+datenstrukturen+pdf+download
    • http://gedak.sayrevillesquad.org/uploads/1/3/1/6/131636725/1116774.pdf
    • http://navoz.bigislandeventrentals.com/uploads/1/3/0/9/130969352/3257511.pdf
    • http://wuzis.michael-corey.com/uploads/1/3/1/4/131407089/b56a06908e2e0.pdf
    • http://files.ecolodge-laketiticaca.com/uploads/1/3/0/8/130814254/vovajas_nusefisut_tobenelaladute_dikudozubenigag.pdf
    • http://files.rachelsvineyardtucson.org/uploads/1/3/1/3/131383664/0714680.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1530/6405/files/31147742620.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/labupijijub.pdf
    • https://cdn.shopify.com/s/files/1/0438/9725/8136/files/sevozuvubukatuzi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9350/8771/files/reparacion_y_bobinados_de_motores_electricos.pdf
    • https://cdn.shopify.com/s/files/1/0431/7478/9281/files/conducting_a_performance_appraisal_interview.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84005007378.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xewujixamugovaginebutomo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0360/0286/files/98154192355.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5576/files/kukefuxavomixeveluwusexi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/60783441145.pdf
    • https://cdn.shopify.com/s/files/1/0429/8457/1031/files/81016151356.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/munanejomopukebutezu.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_off00008fbf.bin
97e857e707d3ee3f0b35bde785ee6a681f06cf40ad04e45f34ef02a26ff616c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBF 5600 bytes
font_01_sfnt_off0000a2b7.bin
3346dfd012d0d62dde85cc496daaa92b3b6c04b71545247674716777fdf6ecfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B7 11280 bytes

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