Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9dd95e1d94e266…

MALICIOUS

PDF

40.4 KB Created: 2020-07-11 00:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d86e27ed07a847e2d966b9be8eba00d8 SHA-1: 544155c78553b3f9a9bb006d8c5e68b5f9c9ddff SHA-256: aa9dd95e1d94e26695c2630da94bdc8c27fe59ce01c6de624234fd11ae0feb27
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link to a malicious redirector, identified as 'ttraff.cc', which is designed to lure users into downloading content. The document body, though heavily obfuscated, also contains numerous links to external PDF files, suggesting a link farm or SEO poisoning tactic to attract downloads. The ML classifier strongly indicated maliciousness, supporting the presence of these malicious links.

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=the+a.+b.+c.+murders+pdf+free+download
    • http://files.jessedochnahl.com/uploads/1/3/1/4/131406108/4936824.pdf
    • http://files.chenowethbairddesign.com/uploads/1/3/1/8/131871894/kawal_fudomur.pdf
    • http://files.metalmeltdown.com/uploads/1/3/0/7/130775755/36f932b68a.pdf
    • http://files.jisooleeauthor.com/uploads/1/3/2/3/132302999/af7dadb5ccc1.pdf
    • http://files.lacharite.net/uploads/1/3/1/3/131380107/nesapa_sufagasawo_zogujodabujag.pdf
    • http://files.icupearls.org/uploads/1/3/0/8/130874160/didozosumeba.pdf
    • http://files.carpetcleaningislavista.com/uploads/1/3/1/1/131163705/jesevu_torokudeduriwof_telavekarazefi_gomudil.pdf
    • http://files.fastblueprints.com/uploads/1/3/0/7/130739809/1755786.pdf
    • https://goxexisigela34505480.files.wordpress.com/2020/07/posesodixaxunev.pdf
    • https://vodezaxej935192670.files.wordpress.com/2020/06/janulifibinuliwepur.pdf
    • https://kegoxoret.files.wordpress.com/2020/07/bisixu.pdf
    • https://juganomoti.files.wordpress.com/2020/07/2933197830.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/tunonazozaje.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/62819008981.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74133662670.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/kafefumurafevobudax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/95509007145.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fd9.bin
3622e9fdbd6b64f0e94e71373820a9de7db8e861b72adb14567a59af417a5c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD9 5364 bytes
font_01_sfnt_off000071f6.bin
51cf193002c2f1dee58bde01867a046917efaa69531c33cdf1826ace1e0289c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F6 10120 bytes

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