Malicious PDF — malware analysis report

Static analysis result for SHA-256 19051172cb8af71c…

MALICIOUS

PDF

51.6 KB Created: 2020-08-11 08:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddd19c7f2da5da0714b12a5fca604c0c SHA-1: 9353cf0b6f021cdaba07cb84020e0f0a02c08fb8 SHA-256: 19051172cb8af71ca2432ee1e290495928ef757d0fbba55df4b65680402c904b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=download+buku+akuntansi+keuangan+lanjutan+pdf, which is a clear indicator of a phishing or redirection attempt. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign.

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.ru/pify?keyword=download+buku+akuntansi+keuangan+lanjutan+pdf
    • http://files.awakeningsprayer.org/uploads/1/3/0/7/130775441/supurojinonune.pdf
    • http://jipekobo.barroncountysunriserotary.com/uploads/1/3/1/4/131406202/rewevapinelafeba.pdf
    • http://files.jromanoart.com/uploads/1/3/1/6/131606923/wudipiku-nazufibevumaje.pdf
    • http://files.yoghana.org/uploads/1/3/0/7/130776363/925604.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0808/2598/files/65457959474.pdf
    • https://cdn.shopify.com/s/files/1/0440/2744/5398/files/58678971677.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4698/files/19675158411.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/81930447187.pdf
    • https://cdn.shopify.com/s/files/1/0427/6423/9014/files/tagalog_christian_songs_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/55731107489.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/gun_mayhem_4.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7511/files/52054515670.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/anita_blake_micah.pdf
    • https://cdn.shopify.com/s/files/1/0433/8669/9925/files/lubireti.pdf
    • https://cdn.shopify.com/s/files/1/0435/3572/8794/files/80769778001.pdf
    • https://cdn.shopify.com/s/files/1/0430/2766/0951/files/57537292249.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/42312919231.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_off000089ba.bin
2395afbd8faa0a73b4a3ed95184ae9856b8214faf18d22f15e6c182fab7ed410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89BA 5484 bytes
font_01_sfnt_off00009c8f.bin
2493b81d15441a1b57510c3d1a28ee72179289d907364ce4b4593be4ffa3d886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C8F 10696 bytes

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