Malicious PDF — malware analysis report

Static analysis result for SHA-256 1021e88bef58a3a2…

MALICIOUS

PDF

41.7 KB Created: 2020-08-24 02:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5939f84744439f0aecf85cfa59b70a54 SHA-1: 58feded877132006925b496447979adbfc7d87f8 SHA-256: 1021e88bef58a3a2d203f87853c33c25850a61f4738ec6c6aeac153646ea14b7
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Spark browser free new version' and a URL that appears to be part of a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as 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.com/pify?keyword=spark+browser+free++new+version
    • http://files.jarryjornopublishing.com/uploads/1/3/1/4/131454352/pimoful.pdf
    • http://dulow.jerkoffbbq.com/uploads/1/3/0/8/130873851/redofukusoli_sorukoreda_nureniroge_kugujerokekefi.pdf
    • http://nadulu.cgpto.org/uploads/1/3/0/7/130739625/kamotatoxusaso-gavuzuz-ralalikigikajem.pdf
    • http://files.fernturnerhair.com/uploads/1/3/1/3/131381006/zofudufekuw_wirode.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/automatic_door_lock_system_project.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/fallin_alicia_keys_chords.pdf
    • https://cdn.shopify.com/s/files/1/0427/4801/8855/files/97267653587.pdf
    • https://cdn.shopify.com/s/files/1/0437/0831/7850/files/xexedebuxulozatavigumik.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7474/files/brickleberry_full_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0461/6250/9987/files/hey_you_pikachu_rom.pdf
    • https://cdn.shopify.com/s/files/1/0433/5022/9160/files/cancer_screening_guidelines_chart.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/understanding_analysis_abbott_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7678/files/subokusinufugediz.pdf
    • https://cdn.shopify.com/s/files/1/0466/4095/5557/files/adani_ports_annual_report_2017-_18.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3658/files/mixomemaxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/52569342492.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_off0000633d.bin
bd035171f95709116352283ff449f98a013faeaf5746b60e56ca1495734bfd40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x633D 5320 bytes
font_01_sfnt_off00007580.bin
9ee2374e55fad86257361aa5de22ca13c704363e9568485110d33eaf772b352b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7580 10648 bytes

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